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Posts Tagged ‘Mars’

Ephemeris: 02/26/2025 – Where are the naked-eye planets this week?

February 26, 2025 Comments off

This is Ephemeris for Wednesday, February 26th. Today the Sun will be up for 11 hours and 2 minutes, setting at 6:26, and it will rise tomorrow at 7:23. The Moon, 1 day before new, will rise at 7:25 tomorrow morning.

Let’s take our weekly look at the whereabouts of the naked-eye planets. At 7:15 PM this evening four of the five naked eye planets will be out. Starting from the west we have Venus the brightest of all. Far below it, near the horizon, will be the much dimmer Mercury, making its evening appearance, replacing Saturn. Jupiter, the second-brightest planet will be high in the south. It is slowly heading eastward now above the star Aldebaran. Farther below and left of it is the spectacular constellation of Orion the hunter. The 4th planet out is Mars, the third-brightest planet now, with its distinctive reddish hue in the east-southeast, to the right of the stars Castor and Pollux in Gemini.

The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EST, UT – 5 hours). Times will be different for other locations.

Addendum

A 7:15 PM February 26, 2025 planet panorama. Venus and Mercury are in the west, and Jupiter is in the south. Mars is in the southeast.
A 7:15 PM February 26, 2025 planet panorama. Venus and Mercury are in the west, and Jupiter is in the south. Mars is in the southeast. Saturn is setting not visible in the evening sky.. The in this projection the ecliptic (orange line) is a straight line, so the planets and Moon nearly line up, but the horizon is a curved line. Click or tap on the image to enlarge it. Created using Stellarium.
Telescopic Venus, Jupiter and Mars (north up) as they would be seen in a small telescope with the same magnification.
Telescopic Venus, Jupiter and Mars (north up) as they would be seen in a small telescope with the same magnification. All the planets are shown for tonight, 8 PM, February 26, 2025. Apparent diameters: Venus 47.3″ and rapidly growing as it approaches us, 16.5% illuminated, it now appears larger than Jupiter; Jupiter 39.9″; Mars, 11.1″. Mercury, which is not shown only appears 5.8″ in diameter. Planetary surface detail is more subtle than shown here. The ” means seconds of arc, or 1/3600th of a degree. Click or tap on the image to enlarge it. Created using Cartes du Ciel (Sky Charts).
The naked-eye planets and the Moon at sunset and sunrise on a single night
The naked-eye planets and the Moon at sunset and sunrise on a single night, starting with sunset on the right on February 26, 2025. The night ends on the left with sunrise on the 27th. Click or tap on the image to enlarge it. Created using my LookingUp app and GIMP.
A low precision ephemeris of the Sun Moon and naked eye planet positions for today and tomorrow
This is a low precision ephemeris of the Sun Moon and naked eye planet positions for today and tomorrow, February 26 and 27, 2025. Some of the columns are self-explanatory, others not. The transit column is the time that the body crosses the meridian and is due south. Elong, for elongation, is the angle between the Sun and that body. RA is right ascension, which is the object’s east-west position on the celestial sphere in hours and minutes. Dec is declination which is the north-south position of the object on the celestial sphere in degrees and minutes. R is the distance of that object from the Sun in astronomical units. An astronomical unit is about 93 million miles or 150 million kilometers. And Delta is the distance of that object from the Earth, also in astronomical units. I omit the ‘m’ in am and pm for compactness. The data was generated using my LookingUp for DOS app and displayed as a table by my Ephemeris Helper app.
Categories: Ephemeris Program, Naked-eye planets, Observing, Planets Tags: , , , , ,

Ephemeris: 02/24/2025 – Mars stopped in its tracks!

February 24, 2025 Comments off

This is Ephemeris for Monday, February 24th. Today the Sun will be up for 10 hours and 55 minutes, setting at 6:24, and it will rise tomorrow at 7:26. The Moon, 3 days before new, will rise at 6:30 tomorrow morning.

Today the planet Mars is said to be stationary. No, planets do not stop in their orbits of the Sun. It is because we are viewing them from the moving planet Earth. For the last few months Mars has been moving to the west, which is not its normal motion, so we call it retrograde motion. It does that because the Earth, moving faster on an inner orbit, is passing Mars moving slower on an outer orbit. This was a problem for the ancients of the western world because they thought all the moving objects, all seven of them, moved around a stationary Earth. Of those seven, two of them never went backwards, or westward against the stars. They were: the Moon which does orbit the Earth and the Sun which the Earth orbits.

The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EST, UT – 5 hours). Times will be different for other locations.

Addendum

Mars' track in the sky from November 26th of 2024 until March 6th 2025.
Mars’ track in the sky from November 26th of 2024 until 10 days from now March 6th 2025. The plot started 11 days before Mars was stationary and began its retrograde motion until 10 days after today, another stationary point, where Mars stops moving retrograde and will begin moving in its normal eastward motion. Mars is plotted at 10 days intervals. The labeling is quite minimal: the year and the month is only displayed when they change, and the month is in Roman numerals. The 15 at the center of the plot (January 15, 2025) is the date Mars was in opposition with the Sun or opposite the Sun in the sky, a time when Mars is at or near its closest to the Earth. Created using Stellarium.
The cause of retrograde motion, in the case of Mars, is that the Earth is passing Mars
The cause of retrograde motion, in the case of Mars, is that the Earth is passing Mars. Both travel in the counterclockwise direction, or if you’re near the plane of the solar system, appear to move eastward. As the Earth passes a planet, it will appear to move westward for a while. This is made up when Mars is behind the Sun in conjunction. It will make up for all the time it’s been dallying around near opposition time. Incidentally, the same is true when an inferior* planet like Venus or Mercury passes between the Earth and the Sun it will for a short period of time also move in a retrograde direction. Again making up for it on the other side of the Sun near superior conjunction. BTW: The positions of the planets coorespond to the positions and dates of the Mars track in the above image. Created using my Looking up app LibreOffice draw for the captions and pointers.

* For non astronomers: Inferior doesn’t refer to quality, but that the planet’s orbit is inside the Earth’s orbit. Superior planets orbit farther out from the Sun than the Earth.

Categories: Concepts, Ephemeris Program, Planets Tags: ,

Ephemeris: 02/19/2025 – All the naked-eye planets are seen in the evening this week

February 19, 2025 Comments off

Ephemeris: 02/19/2025 – Where have the naked-eye planets wandered off to this week?

This is Ephemeris for Wednesday, February 19th. Today the Sun will be up for 10 hours and 40 minutes, setting at 6:17, and it will rise tomorrow at 7:34. The Moon, 1 day before last quarter, will rise at 1:59 tomorrow morning.

Let’s take our weekly look at the whereabouts of the naked-eye planets. At 7 PM this evening four of the five naked eye planets will be out. Starting from the West we have Venus the brightest of all in the west southwest. Far below it, near the horizon, will be the much dimmer Saturn, which we are about to lose, or may already have, to the evening twilight. Jupiter, the second-brightest planet will be high in the south. It has reversed course and is heading back eastward now. Farther below it is the spectacular constellation of Orion the hunter. The fourth planet out is Mars, the third-brightest planet now, with its distinctive reddish hue, west of the stars Castor and Pollux in Gemini, and in the east-southeast.

The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EST, UT – 5 hours). Times will be different for other locations.

Addendum

A 7 PM February 19, 2025 planet panorama
A 7 PM February 19, 2025 planet panorama. Venus and Saturn are in the west-southwest, and Jupiter is in the south-southeast. Mars is in the east. This looks like the last time Saturn will be visible in the evening sky for a while. The in this projection the ecliptic (not shown) is a straight line, so the planets and Moon nearly line up, but the horizon is curved. Click or tap on the image to enlarge it. Created using Stellarium.
The Moon tomorrow morning
The Moon tomorrow morning, February 20, 2025, as it might appear in a small telescope at 6 AM, in the south. Selected features are labeled. Created using Stellarium, LibreOffice Draw, and GIMP.
Telescopic Venus, Jupiter and Mars
Telescopic Venus, Jupiter and Mars (north up) as they would be seen in a small telescope with the same magnification. All the planets are shown for tonight, 8 PM, February 19, 2025. Apparent diameters: Venus 42.4″ and rapidly growing as it approaches us, 22.9% illuminated, it now appears larger than Jupiter; Jupiter 40.8″; Mars, 11.8″. Planetary surface detail is more subtle than shown here. The ” means seconds of arc, or 1/3600th of a degree. Click or tap on the image to enlarge it. Created using Cartes du Ciel (Sky Charts).
The naked-eye planets and the Moon at sunset and sunrise on a single night
The naked-eye planets and the Moon at sunset and sunrise on a single night, starting with sunset on the right on February 19, 2025. The night ends on the left with sunrise on the 20th. Click or tap on the image to enlarge it. Created using my LookingUp app and GIMP.
A low precision ephemeris of the Sun Moon and naked eye planet positions for today and tomorrow
This is a low precision ephemeris of the Sun Moon and naked eye planet positions for today and tomorrow, February 19 and 20, 2025. Some of the columns are self-explanatory, others not. The transit column is the time that the body crosses the meridian and is due south. Elong, for elongation, is the angle between the Sun and that body. RA is right ascension, which is the object’s east-west position on the celestial sphere in hours and minutes. Dec is declination which is the north-south position of the object on the celestial sphere in degrees and minutes. R is the distance of that object from the Sun in astronomical units. An astronomical unit is about 93 million miles or 150 million kilometers. And Delta is the distance of that object from the Earth, also in astronomical units. I omit the ‘m’ in am and pm for compactness. The data was generated using my LookingUp for DOS app and displayed as a table by my Ephemeris Helper app.
Categories: Ephemeris Program, Naked-eye planets, Observing, Planets Tags: , , , , ,

Ephemeris: 02/12/2025 – Taking our weekly look at the whereabouts of the naked-eye planets

February 12, 2025 Comments off

This is Ephemeris for Darwin Day, Wednesday, February 12th. Today the Sun will be up for 10 hours and 20 minutes, setting at 6:07, and it will rise tomorrow at 7:45. The Moon, at full today, will rise at 6:21 this evening.

Let’s take our weekly look at the whereabouts of the naked-eye planets. At 7 PM this evening four of the five naked eye planets will be out. Starting from the West we have Venus the brightest of all in the west southwest. Far below it, near the horizon, will be the much dimmer Saturn, which we are about to lose to the evening twilight. Jupiter, the second-brightest planet will be high in the south-southeast. It is reversing course and beginning to head back eastward now. Farther below it is the spectacular constellation of Orion the hunter. The 4th planet out is Mars, the third-brightest planet now, with its distinctive reddish hue, west of the stars Castor and Pollux in Gemini, and just about due east. The full Moon will be rising in the east.

The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EST, UT – 5 hours). Times will be different for other locations.

Addendum

A 7 PM February 12, 2025 planet panorama
A 7 PM February 12, 2025 planet panorama. Venus and Saturn are in the west-southwest, and Jupiter is in the south-southeast. Mars is in the east. The in this projection the ecliptic (not shown) is a straight line, so the planets and Moon nearly line up, but the horizon is curved. Click or tap on the image to enlarge it. Created using Stellarium.
The Moon tonight, February 12, 2025, as it might appear in a small telescope at 7 PM
The Moon tonight, February 12, 2025, as it might appear in a small telescope at 7 PM, shortly after rising. Since this is about 10 hours after the Moon was full, shadows are beginning to be visible in craters at the upper right edge. Selected features are labeled. Created using Stellarium, LibreOffice Draw, and GIMP.
Telescopic Saturn, Venus, Jupiter and Mars as they would be seen in a small telescope with the same magnification
Telescopic Saturn, Venus, Jupiter and Mars (north up) as they would be seen in a small telescope with the same magnification. All the planets are shown for tonight, 8 PM,February 5, 2025. Apparent diameters: Saturn 15.8″, its rings 36.8″, 2.2 degrees from edge on and closing; Venus 38.0″ and rapidly growing as it approaches us, 28.9% illuminated; Jupiter 41.8″; Mars, 12.7″. Planetary surface detail is more subtle than shown here. The ” means seconds of arc, or 1/3600th of a degree. Click or tap on the image to enlarge it. Created using Cartes du Ciel (Sky Charts).
The naked-eye planets and the Moon at sunset and sunrise on a single night, starting with sunset on the right on February 12, 2025. The night ends on the left with sunrise on the 13th.
The naked-eye planets and the Moon at sunset and sunrise on a single night, starting with sunset on the right on February 12, 2025. The night ends on the left with sunrise on the 13th. Click or tap on the image to enlarge it. Created using my LookingUp app and GIMP.
This is a low precision ephemeris of the Sun Moon and naked eye planet positions for today and tomorrow
This is a low precision ephemeris of the Sun Moon and naked eye planet positions for today and tomorrow, February 12 and 13, 2025. Some of the columns are self-explanatory, others not. The transit column is the time that the body crosses the meridian and is due south. Elong, for elongation, is the angle between the Sun and that body. RA is right ascension, which is the object’s east-west position on the celestial sphere in hours and minutes. Dec is declination which is the north-south position of the object on the celestial sphere in degrees and minutes. R is the distance of that object from the Sun in astronomical units. An astronomical unit is about 93 million miles or 150 million kilometers. And Delta is the distance of that object from the Earth, also in astronomical units. I omit the ‘m’ in am and pm for compactness. The data was generated using my LookingUp for DOS app and displayed as a table by my Ephemeris Helper app.

Categories: Ephemeris Program, Naked-eye planets, Observing, Planets Tags: , , , , ,

Ephemeris: 02/05/2025 – Let’s take our weekly look at the naked-eye planets

February 5, 2025 Comments off

This is Ephemeris for Wednesday, February 5th. Today the Sun will be up for 10 hours and 1 minute, setting at 5:57, and it will rise tomorrow at 7:55. The Moon, at first quarter today, will set at 3:14 tomorrow morning.

Let’s take our weekly look at the whereabouts of the naked-eye planets. At 7:30 PM this evening four of the five naked eye planets will be out. Starting from the West we have Venus the brightest of all in the west southwest. Far below it, near the horizon, will be the much dimmer Saturn. Jupiter, the second-brightest planet will be high in the south-southeast. It is reversing course and beginning to head back eastward now. Farther below it is the spectacular constellation of Orion the hunter. The 4th planet out is Mars, the third-brightest planet now, with its distinctive reddish hue, near the star Pollux in Gemini, and just about due east. The fifth naked eye planet, Mercury, is too close to the Sun to be visible.

The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EST, UT – 5 hours). Times will be different for other locations.

Addendum

A 7 PM February 5, 2025 planet panorama
A 7 PM February 5, 2025 planet panorama. Venus and Saturn are in the west-southwest, and Jupiter is in the south-southeast. Mars is in the east. The in this projection the ecliptic (not shown) is a straight line, so the planets and Moon nearly line up, but the horizon is curved. Click or tap on the image to enlarge it. Created using Stellarium.
The Moon tonight, February 5, 2025, as it might appear in a small telescope. Selected features are labeled. Created using Stellarium, LibreOffice Draw, and GIMP.
Telescopic Saturn, Venus, Jupiter and Mars
Telescopic Saturn, Venus, Jupiter and Mars (north up) as they would be seen in a small telescope with the same magnification. All the planets are shown for tonight, 8 PM,February 5, 2025. Apparent diameters: Saturn 15.9″, its rings 37.0″, 2.6 degrees from edge on and closing; Venus 34.3″, 34.5% illuminated; Jupiter 42.7″; Mars, 13.3″. Planetary surface detail is more subtle than shown here. The ” means seconds of arc, or 1/3600th of a degree. Click or tap on the image to enlarge it. Created using Cartes du Ciel (Sky Charts).
The naked-eye planets and the Moon at sunset and sunrise on a single night, starting with sunset on the right on February 5, 2025. The night ends on the left with sunrise on the 6th.
The naked-eye planets and the Moon at sunset and sunrise on a single night, starting with sunset on the right on February 5, 2025. The night ends on the left with sunrise on the 6th. Click or tap on the image to enlarge it. Created using my LookingUp app and GIMP.
A low precision ephemeris of the Sun Moon and naked eye planet positions for today and tomorrow, February 5 and 6, 2025
This is a low precision ephemeris of the Sun Moon and naked eye planet positions for today and tomorrow, February 5 and 6, 2025. Some of the columns are self-explanatory, others not. The transit column is the time that the body crosses the meridian and is due south. Elong, for elongation, is the angle between the Sun and that body. RA is right ascension, which is the object’s east-west position on the celestial sphere in hours and minutes. Dec is declination which is the north-south position of the object on the celestial sphere in degrees and minutes. R is the distance of that object from the Sun in astronomical units. An astronomical unit is about 93 million miles or 150 million kilometers. And Delta is the distance of that object from the Earth, also in astronomical units. I omit the ‘m’ in am and pm for compactness. The data was generated using my LookingUp for DOS app and displayed as a table by my Ephemeris Helper app.
Categories: Ephemeris Program, Naked-eye planets, Observing Tags: , , , , ,

Ephemeris: 01/29/2025 – Our weekly look at the whereabouts of the naked-eye planets

January 29, 2025 Comments off

This is Bob Moler with Ephemeris for Wednesday, January 29th. Today the Sun will be up for 9 hours and 42 minutes, setting at 5:47, and it will rise tomorrow at 8:03. The Moon is new today, and won’t be visible.

Let’s take our weekly look at the whereabouts of the naked-eye planets. At 8 PM this evening four of the five naked eye planets will be out. Starting from the West we have Venus the brightest of all low in the west southwest. Almost directly below it will be the much dimmer Saturn. Jupiter, the second-brightest planet will be high in the south-southeast. Below it is the letter V shape of stars that is the head of Taurus the bull. Farther below is the spectacular constellation of Orion the hunter. The 4th planet out is Mars, the third-brightest planet now, with its distinctive reddish hue, near the star Pollux in Gemini, and just about due east. The fifth naked eye planet, Mercury, is too close to the Sun in the morning to be visible.

The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EST, UT – 5 hours). Times will be different for other locations.

Addendum

An 8 PM January 29, 2025 planet panorama
An 8 PM January 29, 2025 planet panorama. Venus and Saturn are in the west-southwest, and Jupiter is in the south-southeast. Mars is in the east. Click or tap on the image to enlarge it. Created using Stellarium.
Telescopic Saturn, Venus, Jupiter and Mars (north up) as they would be seen in a small telescope with the same magnification
Telescopic Saturn, Venus, Jupiter and Mars (north up) as they would be seen in a small telescope with the same magnification. All the planets are shown for tonight, 8 PM, January 29, 2025. Apparent diameters: Saturn 16.0″, its rings 37.3″, 3.0 degrees from edge on andclosing; Venus 30.7″, 40.0% illuminated; Jupiter 43.8″; Mars, 13.9″. Planetary surface detail is more subtle than shown here. Europa will disappear behind Jupiter at 9:44 PM EST (UT-5), and reappear from the planet’s shadow at 2:39 AM. The ” means seconds of arc, or 1/3600th of a degree. Click or tap on the image to enlarge it. Created using Cartes du Ciel (Sky Charts).
The naked-eye planets and the Moon at sunset and sunrise on a single night
The naked-eye planets and the Moon at sunset and sunrise on a single night, starting with sunset on the right on January 29, 2025. The night ends on the left with sunrise on the 30th. Click or tap on the image to enlarge it. Created using my LookingUp app and GIMP.
Low precision ephemeris of the Sun Moon and naked eye planet positions for today and tomorrow
This is a low precision ephemeris of the Sun Moon and naked eye planet positions for today and tomorrow, January 29 and 30, 2025. Some of the columns are self-explanatory, others not. The transit column is the time that the body crosses the meridian and is due south. Elong, for elongation, is the angle between the Sun and that body. RA is right ascension, which is the object’s east-west position on the celestial sphere in hours and minutes. Dec is declination which is the north-south position of the object on the celestial sphere in degrees and minutes. R is the distance of that object from the Sun in astronomical units. An astronomical unit is about 93 million miles or 150 million kilometers. And Delta is the distance of that object from the Earth, also in astronomical units. I omit the ‘m’ in am and pm for compactness. The data was generated using my LookingUp for DOS app and displayed as a table by my Ephemeris Helper app.
Categories: Ephemeris Program, Naked-eye planets, Observing Tags: , , , , ,

Ephemeris: 01/27/2025 – Gemini the twins with Mars this year

January 27, 2025 Comments off

This is Ephemeris for Monday, January 27th. Today the Sun will be up for 9 hours and 38 minutes, setting at 5:44, and it will rise tomorrow at 8:05. The Moon, 2 days before new, will rise at 8:00 tomorrow morning.

Another famous winter constellation is Gemini. The constellation of Gemini the Twins is visible halfway to the zenith in the east, at the top and left of Orion the hunter, at 9 pm. The namesake stars of the two lads, are the two bright stars at the left end of Gemini, and are high and are due east. Castor is on top, while Pollux is below. From them come two lines of stars that outline the two, extending horizontally toward Orion. Mars is passing in front of the stars of Gemini during the first quarter of this year, reaching the western end of its retrograde loop and doubling back to the east. In Greek mythology the Gemini twins were half brothers, Castor was fathered by a mere mortal, while Pollux was fathered by Zeus, but were born together as twins. When Castor was killed during the quest for the Golden Fleece, Pollux pleaded with Zeus to let him die also, so Zeus placed them together in the sky.

The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EST, UT – 5 hours). Times will be different for other locations.

Addendum

The image of Gemini in four frames.
The image of Gemini in four frames. The first are the stars of the constellation Gemini with the planet Mars as it would be seen tonight, January 27th 2025. The second are the lines of the constellation as I see it, with the star names of Castor and Pollux and another star of the constellation. The third is Stellarium’s image of the twins against the stars. The fourth frame is the track of Mars against the stars of Gemini over the period of the three months January through March 2025 shown at 10 day intervals. Created using Stellarium, LibreOffice Draw, and GIMP.
Categories: Constellations, Ephemeris Program, Mythology, Observing Tags: , , ,

Ephemeris: 01/22/2025 – Let’s take our weekly look at the whereabouts of the naked-eye planets

January 22, 2025 Comments off

This is Ephemeris for Wednesday, January 22nd. Today the Sun will be up for 9 hours and 26 minutes, setting at 5:38, and it will rise tomorrow at 8:10. The Moon, 1 day past last quarter, will rise at 3:07 tomorrow morning.

Let’s take our weekly look at the whereabouts of the naked-eye planets. At 8 PM this evening four of the five naked eye planets will be out. Starting from the West we have Venus the brightest of all low in the west southwest. Directly below it will be the much dimmer Saturn. Jupiter, the second-brightest planet will be high in the southeast. Below and right of it is the letter V shape of stars that is the head of Taurus the bull. Farther below is the spectacular constellation of Orion the hunter. The 4th planet out is Mars, the third brightest planet now, with its distinctive reddish hue, near the star Pollux in Gemini. The fifth naked eye planet, Mercury, is too close to the Sun in the morning to be visible.

The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EST, UT – 5 hours). Times will be different for other locations.

Addendum

An 8 PM January 22, 2025, planet panorama.
An 8 PM January 22, 2025 planet panorama. Venus and Saturn are in the west-southwest, and Jupiter is in the southeast. Mars is in the east. The orange line is the ecliptic, the path of the Sun in the sky, and near which all the planets are seen. Also shown are the zodiacal constellations. Click or tap on the image to enlarge it. Created using Stellarium.
The Moon as it might appear through a small telescope tomorrow morning, January 23, 2025
The Moon as it might appear through a small telescope tomorrow morning, January 23, 2025. Selected features are labeled. Created using Stellarium, LibreOffice draw, and GIMP.
Telescopic Saturn, Venus, Jupiter and Mars (north up) as they would be seen in a small telescope with the same magnification
Telescopic Saturn, Venus, Jupiter and Mars (north up) as they would be seen in a small telescope with the same magnification. All the planets are shown for tonight, 8 PM, January 22, 2025. Apparent diameters: Saturn 16.1″, its rings 37.5″, 3.3 degrees from edge on (closing); Venus 28.4″, 43.8% illuminated; Jupiter 44.6″; Mars, 14.3″. Planetary surface detail is more subtle than shown here. Jupiter’s moon Europa is behind the planet and will reappear on the east or trailing side of the planet around midnight EST (5:00 UT). The ” means seconds of arc, or 1/3600th of a degree. Click or tap on the image to enlarge it. Created using Cartes du Ciel (Sky Charts).
The naked-eye planets and the Moon at sunset and sunrise on a single night, starting with sunset on the right on January 22, 2025. The night ends on the left with sunrise on the 23rd. Click or tap on the image to enlarge it. Created using my LookingUp app and GIMP.
This is a low precision ephemeris of the Sun Moon and naked eye planet positions for today and tomorrow, January 22 and 23, 2025
This is a low precision ephemeris of the Sun Moon and naked eye planet positions for today and tomorrow, January 22 and 23, 2025. Some of the columns are self-explanatory, others not. The transit column is the time that the body crosses the meridian and is due south. Elong, for elongation, is the angle between the Sun and that body. RA is right ascension, which is the object’s east-west position on the celestial sphere in hours and minutes. Dec is declination which is the north-south position of the object on the celestial sphere in degrees and minutes. R is the distance of that object from the Sun in astronomical units. An astronomical unit is about 93 million miles or 150 million kilometers. And Delta is the distance of that object from the Earth, also in astronomical units. I omit the ‘m’ in am and pm for compactness. The data was generated using my LookingUp for DOS app and displayed as a table by my Ephemeris Helper app.
Categories: Ephemeris Program, Naked-eye planets, Observing, Planets Tags: , , , , ,

Ephemeris: 01/20/2025 – The planets augment the Winter Hexagon

January 20, 2025 Comments off

This is Ephemeris for Martin Luther King Jr. Day, Monday, January 20th. Today the Sun will be up for 9 hours and 22 minutes, setting at 5:35, and it will rise tomorrow at 8:12. The Moon, 1 day before last quarter, will rise at 12:56 tomorrow morning.

The winter circle or more properly hexagon, seen in the winter sky this evening, has the addition of two planets, and they’re in the proper location so that they don’t spoil the hexagon. We start at the top with the star Capella high in the east. We move clockwise downward to Jupiter and below it the star Aldebaran. We drop lower to Orion’s knee and the star Rigel, then down to Sirius, low in the southeast, the brightest nighttime star, but doesn’t hold a candle to Jupiter. Then we go above left to Procyon and upwards and left to Mars, which is near Pollux, and finally back up to Capella. That’s that is our winter hexagon right now, so take it in while you can, before Jupiter and Mars move off and mess it up.

The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EST, UT – 5 hours). Times will be different for other locations.

Addendum

The Winter Hexagon, right now, with Jupiter replacing Aldebaran and Mars replacing Pollux
The Winter Hexagon, for tonight at 8 PM, January 20, 2025, with Jupiter replacing Aldebaran and Mars replacing Pollux, but still keeping the basic shape of the hexagon. This will soon change as Jupiter and especially Mars eventually begin to move eastward. Created using Stellarium, LibreOffice Draw, and GIMP.

As for events happening on Earth: Resist!

Categories: Asterism, Ephemeris Program, Observing, Planets, Stars Tags: , , , , , , , ,

Ephemeris: 01/15/2025 – Our weekly look at the whereabouts of the naked-eye planets

January 15, 2025 Comments off

This is Ephemeris for Wednesday, January 15th. Today the Sun will be up for 9 hours and 12 minutes, setting at 5:28, and it will rise tomorrow at 8:15. The Moon, 2 days past full, will rise at 7:27 this evening.

Let’s take our weekly look at the whereabouts of the naked-eye planets. At 8 PM this evening four of the five naked eye planets will be out. Starting from the West we have Venus the brightest of all low in the west southwest. Left and a bit above it is Saturn. They will appear at their closest Friday and Saturday nights. Jupiter, the second-brightest planet will be high in the southeast. The 4th planet out is Mars, which is at opposition from the Sun tonight. Mars will not get this close to the Earth again until 2031. It shines with its reddish hue a third as bright as Jupiter in the eastern sky. On unusually close approaches, Mars can actually outshine Jupiter. The fifth naked eye planet, Mercury, is too close to the Sun on the morning side to be visible.

The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EST, UT – 5 hours). Times will be different for other locations.

Addendum

A 8 PM January 15, 2025 planet panorama
A 8 PM January 15, 2025 planet panorama. Venus and Saturn are in the west-southwest, and Jupiter is in the southeast. Mars is in the east-northeast. The waning gibbous Moon is rising in the east-northeast. The first magnitude stars are also named. Click or tap on the image to enlarge it. Created using Stellarium.
The Moon tonight at 9 PM, January 15, 2025, as it might appear in a small telescope
The Moon tonight at 9 PM, January 15, 2025, as it might appear in a small telescope. Selected features are labeled. Created using Stellarium, LibreOffice Draw, and GIMP.

Translations of some lunar feature names according to Virtual Moon Atlas

Mare Cognitum – Sea of Knowledge
Mare Crisium – Sea of Crises
Mare Fecunditatis – Sea of Fruitfulness
Mare Frigoris – Sea of Cold
Mare Humorum – Sea of Moisture
Mare Imbrium – Sea of Showers
Mare Nectaris – Sea of Nectar
Mare Nubium – Sea of Clouds
Mare Serenitatis – Sea of Serenity
Mare Tranquillitatis – Sea of Tranquility
Mare Vaporum – Sea of Vapors
Montes Alpes – Alps Mountains
Montes Apenninus – Apennines Mountains
Oceanus Procellarum – Ocean of Storms
Sinus Iridium – Bay of Rainbows
Sinus Medii – Central Bay

Mare is pronounced Mar-e. Craters are named for persons, real or otherwise.

Telescopic Venus, Saturn, Jupiter and Mars
Telescopic Venus, Saturn, Jupiter and Mars (north up) as they would be seen in a small telescope with the same magnification. All the planets are shown for tonight, 8 PM, January 15, 2025. Apparent diameters: Venus 26.1″, 47.8% illuminated; Saturn 16.2″, its rings 37.8″, 3.7 degrees from edge on (closing); Jupiter 45.5″; Mars, 14.6″. Planetary surface detail is more subtle than shown here. Jupiter’s moon Europa is behind the planet and will reappear on Callisto’s side of the planet at 9:22 PM (2:22 UT). The ” means seconds of arc, or 1/3600th of a degree. Click or tap on the image to enlarge it. Created using Cartes du Ciel (Sky Charts).
The naked-eye planets and the Moon at sunset and sunrise on a single night, starting with sunset on the right on January 15, 2025. The night ends on the left with sunrise on the 16th. Click or tap on the image to enlarge it. Created using my LookingUp app and GIMP.
This is a low precision ephemeris of the Sun Moon and naked eye planet positions for today and tomorrow, January 15 and 16, 2025. Some of the columns are self-explanatory, others not. The transit column is the time that the body crosses the meridian and is due south. Elong, for elongation, is the angle between the Sun and that body. RA is right ascension, which is the object’s east-west position on the celestial sphere in hours and minutes. Dec is declination which is the north-south position of the object on the celestial sphere in degrees and minutes. R is the distance of that object from the Sun in astronomical units. An astronomical unit is about 93 million miles or 150 million kilometers. And Delta is the distance of that object from the Earth, also in astronomical units. I omit the ‘m’ in am and pm for compactness. The data was generated using my LookingUp for DOS app and displayed as a table by my Ephemeris Helper app.

Categories: Ephemeris Program, Naked-eye planets, Observing, Planets Tags: , , , , ,