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Ephemeris: 01/31/2024 – Where have the naked-eye planets wandered* off to this week?

January 31, 2024 Comments off

This is Ephemeris for Wednesday, January 31st. Today the Sun will be up for 9 hours and 46 minutes, setting at 5:49, and it will rise tomorrow at 8:02. The Moon, 2 days before last quarter, will rise at 11:56 this evening.

Let’s find out where the naked-eye planets have wandered off to this week. Three of those five planets are now visible. Saturn and Jupiter are the evening planets. Saturn is getting harder to spot low in the west-southwest, nearly succumbing to evening twilight, setting at 7:59 pm. Jupiter will move from high in the south to low in the west by midnight, and will set in the west-northwest at 1:20 am. Venus, the brilliant morning star, will rise in the east-southeast at 6:18 am, and be a brilliant beacon in the morning, shining in the southeast before the bright morning twilight claims it around 7:45 am. As we advance through winter into spring Venus is going to be harder to spot before sunrise.

The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EST, UT –5 hours). They may be different for your location.

Addendum

Jupiter and Saturn as they would appear in the southwestern quadrant of the sky around 7 pm or about an hour and a quarter after sunset. Saturn will set an hour later, while Jupiter will last past midnight. Created using Stellarium.
The Moon and the star Spica as they might appear in binoculars or a very low power telescope at 3 am EST (8:00 UT) tomorrow morning, February 1st 2024. The exact position of the Moon with respect to Spica may be different for your longitude as compared to about 86° west longitude where I am. Created using Stellarium.
The Morning Star Venus, left, and the last quarter Moon, right, as they might appear about 7:30 am or about half an hour before sunrise February 1st 2024. Created using Stellarium.

Telescopic Saturn, Jupiter and Venus (north up) as they would be seen in a small telescope, with the same magnification. At 7 pm January 31, 2024, for Saturn and Jupiter, and 7:30 am on February 1st, for Venus. Apparent diameters: Saturn 15.66″, its rings 36.48″; Jupiter 39.69″; and Venus 12.22″, 85.8% illuminated. There are some Jovian satellite events this evening. At about 7:40 pm Ganymede will appear from behind Jupiter. The image shows the Ganymede label. However, the moon will be hidden at 7:00 pm. Then at 11:12 this evening Ganymede will enter Jupiter’s shadow, and stay hidden until 12:54 am tomorrow morning. The ” symbol means seconds of arc (1/3600th of a degree). Click or tap on the image to enlarge it. Created using Cartes du Ciel (Sky Charts) and GIMP.
The naked-eye planets and the Moon at sunset and sunrise on a single night, starting with sunset on the right on January 31, 2024. The night ends on the left with sunrise on February 1st. The labels for Mars and Mercury overlap. Click or tap on the image to enlarge it. Created using my LookingUp app and GIMP.

* The Greeks called the moving objects in the sky Planetes meaning Wanderers, from which we get the name Planet. In reality the planets do not wander, or move aimlessly, but move in orbits, discovered by Johannes Kepler, in accordance with the laws of gravitation discovered by Isaac Newton and Albert Einstein. The ancients considered the Sun and Moon planets, because they also moved against the “fixed” stars in the sky. This made seven, adding to the five naked eye planets we know today. These seven objects became the names of the days of the week in many countries. We have retained three of them: Sun’s day, Moon’s day, and Saturn’s day. The rest are named for Norse gods and a goddess.

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Ephemeris: 01/24/2024 – Where have the planets wandered off to this week?

January 24, 2024 Comments off

This is Ephemeris for Wednesday, January 24th. Today the Sun will be up for 9 hours and 29 minutes, setting at 5:39, and it will rise tomorrow at 8:09. The Moon, 1 day before full, will set at 8:36 tomorrow morning.

Let’s find out where the naked-eye planets have wandered off to this week. Three of those five planets are now easily visible. Saturn and Jupiter are the evening planets. Saturn is getting harder to spot low in the west-southwest, setting at 8:19 pm. Jupiter will move from high in the south to low in the west by midnight, and will set in the west-northwest at 1:40 am. Venus, the brilliant morning star, will rise in the east-southeast at 6:09 am, and be a brilliant beacon in the morning, shining in the southeast before the bright morning twilight claims it around 8 am. Mercury, which rises by 7:03 am might just be visible below and left of Venus by 7:30 am.

The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EST, UT –5 hours). They may be different for your location.

Addendum

A panorama of the evening sky
A panorama of the evening sky at 7 pm tonight, January 24, 2024, looking from the east northeast through south to the west to view the Moon, the bright winter stars, Jupiter, in the south, and Saturn, which is close to setting. Click or tap on the image to enlarge it. Created using Stellarium.
The nearly full moon visible in binoculars or small telescopes
The nearly full moon visible in binoculars or small telescopes at 7 this evening, January 24, 2024, showing very little shadow detail. The Moon being fully lit by the Sun and Earth is looking at the Moon from that the same direction. This allows crater rays to be quite visible. The best example of this is the crater Tycho, to the lower right. Rays are thought to be shallow craters caused by the debris kicked out when the impact of the body that created the crater occurred. They show better at full moon because there are no shadows. Otherwise, there would be shadows in these tiny craters, making the rays less visible. Shadows help us see the bigger craters, but only when there are no shadows do these little ejecta craters show up bright. Click or tap on the image to enlarge it. Created using Stellarium, LibreOffice Draw, and GIMP.
Venus and Mercury as seen about 40 minutes before sunrise
Here are Venus and Mercury as seen about 40 minutes before sunrise. That’s about 7:30 am in the Grand Traverse area of Michigan. There’s a good chance that Mercury will be invisible because it’s seen very low in the growing twilight. Mars, just below and left of Mercury, will pass it this weekend, as Mercury moves towards the Sun and Mars moves away. Venus of course is moving towards the Sun also and Mars will pass it about a month from now. Click or tap on the image to enlarge it. Created using Stellarium.
Telescopic Saturn, Jupiter and Venus (north up) as they would be seen in a small telescope, with the same magnification. At 7 pm January 24, 2024, for Saturn and Jupiter, and 7:30 am on the 25th, for Venus. Apparent diameters: Saturn 15.74″, its rings 36.66″; Jupiter 40.61″; and Venus 12.58″, 84.2% illuminated. Mercury appears too small to be shown here, but its apparent diameter is 5.52″ and is 82.5% illuminated. Jupiter's moon Ganymede will be eclipsed by Jupiter's shadow and disappear at 7:10 pm, and will emerge from the shadow at 8:53 pm. The ” symbol means seconds of arc (1/3600th of a degree). Click or tap on the image to enlarge it. Created using Cartes du Ciel (Sky Charts) and GIMP.
Telescopic Saturn, Jupiter and Venus (north up) as they would be seen in a small telescope, with the same magnification. At 7 pm January 24, 2024, for Saturn and Jupiter, and 7:30 am on the 25th, for Venus. Apparent diameters: Saturn 15.74″, its rings 36.66″; Jupiter 40.61″; and Venus 12.58″, 84.2% illuminated. Mercury appears too small to be shown here, but its apparent diameter is 5.52″ and is 82.5% illuminated. Jupiter’s moon Ganymede will be eclipsed by Jupiter’s shadow and disappear at 7:10 pm, and will emerge from the shadow at 8:53 pm. The ” symbol means seconds of arc (1/3600th of a degree). Click or tap on the image to enlarge it. Created using Cartes du Ciel (Sky Charts) and GIMP.
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 24, 2024. The night ends on the left with sunrise on the 25th. The labels for Mars and Mercury overlap, though the planets do not. Mars is the reddish one. Click or tap on the image to enlarge it. Created using my LookingUp app and GIMP.
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Ephemeris: 01/18/2024 – A quick guide to Jupiter for the small telescope

January 18, 2024 Comments off

This is Ephemeris for Thursday, January 18th. Today the Sun will be up for 9 hours and 16 minutes, setting at 5:31, and it will rise tomorrow at 8:14. The Moon, 1 day past first quarter, will set at 2:43 tomorrow morning.

Jupiter is the largest planets and is generally the largest appearing planet in a telescope. Venus appears a bit larger than Jupiter only for about four months when it’s the closest it gets to us. There’s always something going on with Jupiter and its 4 Galilean moons which appear to shuffle back and forth from one side to the other of the planet. Jupiter has cloud bands which run parallel to its equator and to the plane of the moon’s orbits. And it has the Great Red Spot, but that spot is not easily visible in small telescopes. Back in the 1950s it was big and brick red. It is since lost a great deal of its redness and size. The moons can hide behind Jupiter or in its shadow or cross in front of the planet. Tonight Jupiter will appear below and right of the Moon.

The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EST, UT –5 hours). They may be different for your location.

Addendum

Over this evening (January 18, 2024) Europa and Io will be approaching Jupiter and Io will pass Europa to duck behind Jupiter in occultation just before Jupiter sets for us. Callisto will be moving towards Jupiter also, but slowly. Ganymede will be moving a little bit away, being near the furthest extension of its orbit. Created using Cartes du Ciel (Sky Charts).
Categories: Ephemeris Program, Naked-eye planets, Observing, Planets Tags: ,

Ephemeris: 01/17/2024 – Where have the naked-eye planets wandered off to this week?

January 17, 2024 Comments off

This is Ephemeris for Wednesday, January 17th. Today the Sun will be up for 9 hours and 14 minutes, setting at 5:30, and it will rise tomorrow at 8:15. The Moon, at first quarter today, will set at 1:28 tomorrow morning.

Let’s find out where the naked-eye planets have wandered off to this week. Four of those five planets are now visible. Saturn and Jupiter are the evening planets. Saturn can be seen moving from low in the southwest to setting in the west-southwest at 8:42 pm. Jupiter, left of the Moon tonight will move from high in the south to set in the west-northwest at 2:05 am. Venus, the brilliant morning star, will rise in the east-southeast at 5:58 am, and be a brilliant beacon in the morning, shining in the southeast before the bright morning twilight claims it around 8 am. Mercury will also be visible below and left of Venus, and should be visible by 7:30 am. Mars is below left of Mercury, but really is too dim to be seen.

The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EST, UT –5 hours). They may be different for your location.

Addendum

Jupiter, Saturn and the Moon around 7 this evening, January 17, 2024. Jupiter appears brighter and bigger than the Moon, but isn’t. The blooming of the image of stellar type objects is to make them look brighter. The Moon though brighter is shown at its actual apparent size. They look much nicer in the real sky. Created using Stellarium.
The moon tonight about 7 pm this evening, January 17, 2024, as it might appear in binoculars or a small telescope, with selected features labeled. Created using Stellarium, LibreOffice Draw, and GIMP.
Venus and Mercury as they might appear about 7:30 tomorrow morning, January 18th 2024, in the growing twilight. Created using Stellarium.
Telescopic Saturn, Jupiter and Venus (north up) as they would be seen in a small telescope, with the same magnification. At 7 pm January 17, 2024, for Saturn and Jupiter, and 7:30 am on the 18th, for Venus. Apparent diameters: Saturn 15.84″, its rings 36.89″; Jupiter 41.57″; and Venus 12.96″, 82.6% illuminated. Mercury appears too small to be shown here, but its apparent diameter is 6.02″ and is 74.2% illuminated. The ” symbol means seconds of arc (1/3600th of a degree). Click or tap on the image to enlarge it. Created using Cartes du Ciel (Sky Charts) and GIMP.
The naked-eye planets and the Moon at sunset and sunrise on a single night, starting with sunset on the right on January 170, 2024. The night ends on the left with sunrise on the 18th. Click or tap on the image to enlarge it. Created using my LookingUp app and GIMP.

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Ephemeris: 01/12/2024 – Mercury is at greatest western elongation from the Sun today

January 12, 2024 Comments off

This is Ephemeris for Friday, January 12th. Today the Sun will be up for 9 hours and 6 minutes, setting at 5:24, and it will rise tomorrow at 8:17. The Moon, 1 day past new, will set at 6:49 this evening.

The planet Mercury is reaching its greatest western elongation or separation west of the Sun today at a 23.5 degrees angle, which is pretty good actually, although the angle above the horizon where we see Mercury at this point in the year is not the best. However, Venus can be used to spot Mercury because Mercury will be to the lower left of Venus. Binoculars are always helpful in spotting Mercury for the first time. From now until about a week from now Mercury will not move very much in relationship to Venus, but it will be getting somewhat brighter as its phase goes from half illuminated to more gibbous towards full. Early in the spring it will be seen in the evening sky, at a little bit better angle above the horizon, although it will be it will not be as far away from the Sun. Created using Stellarium and GIMP.

The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EST, UT –5 hours). They may be different for your location.

Addendum

Venus, Mercury and Mars at 7:30 this morning
Here we have an image of Venus, Mercury and Mars at 7:30 this morning, the 12th of January 2024 with the atmosphere and the horizon and then showing Mercury’s orbit as seen without the ground or atmosphere getting in the way, showing the complete orbit of Mercury. Note that the Sun does not appear in the center of Mercury’s orbit when we can see the whole thing. Mercury’s orbit is quite elliptical. Mercury is quite far away from the Sun compared to the opposite end of the orbit. We are going to see Mercury at the opposite end of the orbit on March 24th when it is visible in the evening, at it’s greatest eastern elongation. It will appear much closer to the Sun then, at 18.7 degrees which is part of the problem we have in the Northern Hemisphere viewing Mercury compared to folks in the Southern Hemisphere.
Categories: Ephemeris Program, Naked-eye planets, Observing, Planets Tags: ,

Ephemeris: 01/10/2024 – Where have the naked-eye planets wandered off to this week?

January 10, 2024 Comments off

This is Ephemeris for Wednesday, January 10th. Today the Sun will be up for 9 hours and 2 minutes, setting at 5:21, and it will rise tomorrow at 8:18. The Moon, 1 day before new, will rise at 8:59 tomorrow morning.

Let’s find out where the naked-eye planets have wandered off to this week. Four of those five planets are now visible. Mars will rise too close to sunrise to be seen, however. Saturn and Jupiter are the evening planets. Saturn can be seen moving from low in the southwest to setting in the west-southwest at 9:06 pm. Jupiter will be moving from high in the south to the west by midnight and will set at 2:31 am. Venus, the brilliant morning star, will rise in the east-southeast at 5:44 am, and be a brilliant beacon in the morning, shining in the southeast before the bright morning twilight claims it around 8 am. Mercury will also be visible below and left of Venus, and should be visible by 7:30 am.

The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EST, UT –5 hours). They may be different for your location.

Addendum

Jupiter and Saturn as they might appear tonight at 7:00 PM January 10th, 2024. Click on or tap on the image to enlarge it . Created using Stellarium.
Venus and Mercury as they might appear at 7:30 tomorrow morning January 11th, 2024. The bright star to the right of Venus is the reddish star Antares in Scorpius, one of the first of the southern summer stars to appear in the morning sky. Click or tap on the image to enlarge it. Created using Stellarium.
Telescopic Saturn, Jupiter and Venus (north up) as they would be seen in a small telescope, with the same magnification. At 7 pm January 10, 2024, for Saturn and Jupiter, and 7:30 am on the 4th, for Venus. Apparent diameters: Saturn 15.95″, its rings 37.16″; Jupiter 42.56″; and Venus 13.39″, 80.8% illuminated. Mercury appears too small to be shown here, but its apparent diameter is 6.78″ and is 61.2% illuminated. The ” symbol means seconds of arc (1/3600th of a degree). Created using Cartes du Ciel (Sky Charts) and GIMP.
The naked-eye planets and the Moon at sunset and sunrise on a single night, starting with sunset on the right on January 10, 2024. The night ends on the left with sunrise on the 11th. Click or tap on the image to enlarge it. Created using my LookingUp app and GIMP.

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Ephemeris: 01/03/2024 – Where have the naked-eye planets wandered off to this week?

January 3, 2024 Comments off

This is Ephemeris for Wednesday, January 3rd. The Sun will rise at 8:20. It’ll be up for 8 hours and 54 minutes, setting at 5:14. The Moon, at last quarter today, will rise at 1:04 tomorrow morning.

Let’s find out where the naked-eye planets have wandered off to this week. Four of those five planets are now visible. Mars rises too close to sunrise to be seen. Saturn and Jupiter are the only evening planets. Saturn can be seen moving from low in the southwest to setting in the west-southwest at 9:30 pm. Jupiter will be moving from the high in the south-southeast to the west-southwest, by midnight and will set at 2:57 am. The last quarter Moon will be in Virgo tomorrow morning. Venus, the brilliant morning star, will rise in the east-southeast at 5:29 am, and be a brilliant beacon in the morning, shining in the southeast before the bright morning twilight claims it around 8 am. Mercury may be glimpsed below and left of it.

The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EST, UT –5 hours). They may be different for your location.

Addendum

Jupiter and Saturn as they may appear tonight about 7 pm or about an hour and three quarters after sunset tonight January 3rd 2024. Created using Stellarium.
Venus, Mercury and the Moon as they might appear at 7:30 am, about 45 minutes before sunrise. Click or tap on the image to enlarge it. Created using Stellarium.
Annotated Moon as it might be seen at 7:30 tomorrow morning, January 4, 2024. Created using Stellarium, LibreOffice Draw and GIMP.
Telescopic Saturn, Jupiter and Venus (north up) as they would be seen in a small telescope, with the same magnification. At 7 pm January 3, 2024, for Saturn and Jupiter, and 7 am on the 4th, for Venus. Apparent diameters: Saturn 16.08″, its rings 37.47″; Jupiter 43.57″; and Venus 13.86″, 78.9% illuminated. Mercury appears too small to be shown here, but its apparent diameter is 7.93″ and is 40.6% illuminated. The ” symbol means seconds of arc (1/3600th of a degree). Created using Cartes du Ciel (Sky Charts) and GIMP.
The naked-eye planets and the Moon at sunset and sunrise on a single night, starting with sunset on the right on January 3, 2024. The night ends on the left with sunrise on the 4th. Click or tap on the image to enlarge it. Created using my LookingUp app and GIMP.
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Ephemeris: 12/27/2023 – Our last look at the naked-eye planets for 2023

December 27, 2023 Comments off

This is Ephemeris for Wednesday, December 27th. Today the Sun will be up for 8 hours and 49 minutes, setting at 5:08, and it will rise tomorrow at 8:19. The Moon, 1 day past full, will rise at 5:30 this evening.

Let’s find out where the naked-eye planets have wandered off to this week. Three of those five planets are now visible. Mercury and Mars rise too close to sunrise to be seen. Saturn and Jupiter are the only evening planets. Saturn can be seen moving from low in the southwest to setting in the west-southwest at 9:54 pm. Jupiter will be moving from the high in the southeast to the west-southwest, by midnight and will set at 3:24 am. The Moon, the night after it being full, will be in Gemini tonight, not that any of its stars will be visible, making the sky bright. Venus, the brilliant morning star, will rise in the east-southeast at 4:56, am, and be a brilliant beacon in the morning, shining in the southeast by before the bright morning twilight claims it around 8 am.

The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EST, UT –5 hours). They may be different for your location.

Addendum

Jupiter and Saturn as it might be seen at 8 pm tonight, December 27, 2023. Created using Stellarium.
The moon as seen in binoculars or low power telescope tonight, December 27, 2023, at 9 pm. Click or tap on the image to enlarge it. Created using Stellarium, LibreOffice Draw and GIMP.
The morning star Venus at 7:30, or about 50 minutes before sunrise, tomorrow morning, December 28, 2023. Created using Stellarium.
Saturn, Jupiter and Venus (north up) as they would be seen in a small telescope, with the same magnification. At 8 pm December 27, 2023, for Saturn and Jupiter, and 7:30 am on the 28th, for Venus. Apparent diameters: Saturn 16.23″, its rings 37.81″; Jupiter 44.56″; and Venus 14.39″, 76.8% illuminated. The ” symbol means seconds of arc (1/3600th of a degree). Click or tap on the image to enlarge it. Created using Cartes du Ciel (Sky Charts) and GIMP.
The naked-eye planets and the Moon at sunset and sunrise on a single night, starting with sunset on the right on December 27, 2023. The night ends on the left with sunrise on the 28th. Click or tap on the image to enlarge it. Created using my LookingUp app and GIMP.
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Ephemeris: 12/20/2023 – Where are the naked-eye planets this week?

December 20, 2023 Comments off

This is Bob Moler with Ephemeris for Wednesday, December 20th. Today the Sun will be up for 8 hours and 48 minutes, setting at 5:04, and it will rise tomorrow at 8:16. The Moon, 1 day past first quarter, will set at 2:21 tomorrow morning.

Let’s find out where the naked-eye planets have wandered off to this week. Three of those five planets are now visible, but Mercury sets too close to sunset to be seen. And Mars rises too close to sunrise. Saturn and Jupiter are the only evening planets visible. Saturn can be seen moving from low in the south-southwest to setting in the west-southwest at 10:19 pm. Jupiter will be moving from the high in the southeast to the west-southwest, and will be up most of the night until 3:53 am. The slightly waxing gibbous Moon will be seen to the right of Jupiter tonight. Venus, the brilliant morning star, will rise in the east-southeast at 4:56, am, and be a brilliant beacon in the morning, shining in the southeast by 7 am.

The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EST, UT –5 hours). They may be different for your location.

Addendum

Jupiter and Saturn with the waxing gibbous Moon between them tonight
Jupiter and Saturn with the waxing gibbous Moon between them as it might be seen at 8 pm tonight, December 20, 2023. Created using Stellarium.
The moon as it might appear tonight at 8 pm, one day after first quarter. It is animated to label selected features. Click or tap on the image to enlarge it. Created using Stellarium, LibreOffice Draw, and GIMP.
Venus the morning Christmas Star is seen in the southeast at 7:30 am.
Venus the morning Christmas Star is seen in the southeast at 7:30 am, along with two of the bright stars of spring evenings. Click or tap on the image to enlarge it. Created using Stellarium.
Telescopic Saturn, Jupiter and Venus (north up) as they would be seen in a small telescope, with the same magnification. At 8 pm December 20, 2023, for Saturn and Jupiter, and 7:30 am on the 21st, for Venus. Apparent diameters: Saturn 16.39″, its rings 38.18″; Jupiter 45.53″; and Venus 14.97″. The ” symbol means seconds of arc (1/3600th of a degree). Click or tap on the image to enlarge it. Created using Cartes du Ciel (Sky Charts) and GIMP.
The naked-eye planets and the Moon at sunset and sunrise on a single night, starting with sunset on the right on December 20, 2023. The night ends on the left with sunrise on the 21st. The Sun and Mercury abels overwrite each other on the sunset side of the chart. Click or tap on the image to enlarge it. Created using my LookingUp app and GIMP.
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Ephemeris: 12/13/2023 – Where are the naked eye planets this week?

December 13, 2023 1 comment

This is Bob Moler with Ephemeris for Wednesday, December 13th. Today the Sun will be up for 8 hours and 50 minutes, setting at 5:02, and it will rise tomorrow at 8:12. The Moon, 1 day past new, will set at 5:22 this evening.

Let’s find out where the naked-eye planets have wandered off to this week. Three of those five planets are now visible, but Mercury sets too close to sunset to be seen. And Mars rises too close to sunrise. Saturn and Jupiter are the only evening planets visible. Saturn can be seen moving from low in the south-southwest to setting in the west-southwest at 10:44 pm. Jupiter will be moving from the high in the southeast to southwest, and will be up most of the night until 4:22 am. Venus, the brilliant morning star, will rise in the east-southeast at 4:40 am, and be a brilliant beacon in the morning, shining in the southeast by 7 am. Tonight is the first of two nights when the Geminid meteor shower will be at its peak.

The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EST, UT –5 hours). They may be different for your location.

Addendum

Jupiter and Saturn in the evening sky is it might be seen at 7:00 this evening, December 13, 2023. Also shown are the constellations of the Zodiac and the ecliptic line which is the annual path of the Sun. Click or tap on the image to enlarge it. Created using Stellarium.
Venus with the bright stars of spring evenings seen that 7 am tomorrow, December 14, 2023. At this time the Big Dipper is very high in the northeast, so spring will eventually come even though it’s not even winter yet. Created using Stellarium.
Telescopic Saturn, Jupiter and Venus (north up) as they would be seen in a small telescope, with the same magnification. At 7 pm December 13, 2023, for Saturn and Jupiter, and 7 am on the 7th, for Venus. Apparent diameters: Saturn 16.56″, its rings 38.59″; Jupiter 46.46″; and Venus 15.63″, 72.4% illuminated. Io will be transiting the face of Jupiter from 8:34 pm to 10:44 pm, and normally is not visible then. However, its shadow might be seen as a dark spot on the planet from 9:32 pm to 11:42 pm. The ” symbol means seconds of arc (1/3600th of a degree). Click or tap on the image to enlarge it. Created using Cartes du Ciel (Sky Charts) and GIMP.
The naked-eye planets and the Moon at sunset and sunrise on a single night, starting with sunset on the right on December 13, 2023. The night ends on the left with sunrise on the 14th. Click or tap on the image to enlarge it. Created using my LookingUp app and GIMP.

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