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Ephemeris: 10/14/2025 – Ada Lovelace Day

October 14, 2025 1 comment

This is Ephemeris for Ada Lovelace Day, Tuesday, October 14th. Today the Sun will be up for 11 hours and 1 minute, setting at 6:59, and it will rise tomorrow at 7:58. The Moon, 1 day past last quarter, will rise at 1:34 tomorrow morning.

Ada Lovelace (1815-1852), or more properly Augusta Ada King, Countess of Lovelace, was the daughter of Lord Byron and worked for Charles Babbage, a brilliant mechanical engineer and mathematician in the early 19th century. She is considered the first computer programmer. She devised a way to use the same punch cards that were used on the Jacquard loom to store and run her programs, even though Babbage was unable to complete his mechanical computer the Analytical Engine in the mid 1800s. This day is set aside to celebrate the accomplishments of all the women of Science, Technology, Engineering and Math, (STEM). The computer language, Ada, was named after her, and was created for the US Department of Defense or whatever they call it this week.

The astronomical event times given in this blog are for the Traverse City/Interlochen area of Michigan (Lat 44.7° N, Long 85.7° W; EDT, UT – 4 hours) unless stated otherwise. Times will be different for other locations.

Addendum

Portrait of Ada Lovelace by Margaret Sarah Carpenter, 1836
Portrait of Ada Lovelace by Margaret Sarah Carpenter, 1836
Part of Charles Babbage's Analytical Engine on display in 1843.
Part of Charles Babbage’s Analytical Engine on display, in 1843, left of centre in this engraving of the King George III Museum in King’s College, London. Unknown engraver.

The reason I’m interested in Ada Lovelace and her story is that I spent 45 years as a systems analyst, creating and coding computer applications for small businesses and banks. I ended up heading the IT department for a local bank, from which I retired 12 years ago. Astronomy is my hobby, though I’ve made a few bucks at it in my earlier years as a planetarium technician and lecturer.

Ephemeris: 04/18/2025 – How the date of Easter is calculated

April 18, 2025 Comments off

This is Ephemeris for Good Friday, Friday, April 18th. Today the Sun will be up for 13 hours and 39 minutes, setting at 8:32, and it will rise tomorrow at 6:51. The Moon, 2 days before last quarter, will rise at 2:40 tomorrow morning.

Easter will be celebrated by all Christian churches this Sunday. Easter is a movable feast in that it falls on a different date each year following the first full moon of spring. It’s an attempt to follow the Jewish Passover, which starts on the 15th of the month of Nisan. The Jewish calendar being a lunar calendar, the 15th is generally the night of the full moon. And since the Last Supper was a Seder, according to at least one Gospel, the Christian church wanted to link Easter with Passover as closely as possible using the Roman solar based (Julian) calendar. The months didn’t follow the cycle of the Moon anymore and where the year was 365.25 days long. Passover started at sunset last Sunday. The western churches adopted the Gregorian calendar to keep in sync with the seasons. The Orthodox churches didn’t, but Easter is so late that they match this year. They kept the old Julian Calendar and other considerations to calculate the date of Easter.

The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EDT, UT – 4 hours). Times will be different for other locations.

Addendum

The Germanic goddess of spring and dawn Oestre
This is the Germanic goddess of spring and dawn Oestre, from whose name we get the word Easter. Since the dawn arrives from the east, I think the word East may come from her name too. As far as I’ve been able to check the name of the feast of the Resurrection is related to the Passover in most other European countries. Credit: Ostara (Oestre) by Johannes Gehrts (1855–1921), via Wikipedia.

Ephemeris: 09/19/2024 – The Chinese Mid-Autumn Festival

September 19, 2024 Comments off

This is Ephemeris for Thursday, September 19th. Today the Sun will be up for 12 hours and 17 minutes, setting at 7:44, and it will rise tomorrow at 7:28. The Moon, 2 days past full, will rise at 8:30 this evening.

Our Harvest Moon also marks the Chinese Mid-Autumn Festival. I’ve been too busy with the lunar eclipse to cover it on Tuesday. It is to honor the Moon and the story of Chang’e a mortal woman who took an elixir and flew off to the Moon and became a goddess. Another story revolves around the Jade Rabbit pounding Medicine. I sometimes talk about the figure of a rabbit seen on the face of the Moon. He is a companion to Chang’e, and has a mortar and pestle on the Moon with him. He pounds out the medicine that makes the inhabitants of the sky immortal. The Chinese lunar probes are named Chang’e. Chang’e 3 landed on the Moon in 2013 and sent out a lunar rover named Yutu, the Jade Rabbit. They have made other landings since.

The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EDT, UT – 4 hours). Times will be different for other locations.

Addendum

Jade Rabbit on the Moon
Jade Rabbit and Mortar on the Moon. Credit: Zeimusu, Creative Commons.

Ephemeris: 07/22/2024 – Happy Pi Approximation Day

July 22, 2024 Comments off

This is Bob Moler with Ephemeris for Pi Approximation Day*, Monday, July 22nd. Today the Sun will be up for 15 hours exactly, setting at 9:19, and it will rise tomorrow at 6:19. The Moon, 1 day past full, will rise at 10:37 this evening.

The first Pi day of the year for mathematics junkies was March 14th utilizing the three most significant digits of the mathematical value π, the ratio of the circumference of a circle to its diameter, written as 3.14. Today is the second version of π written as the fraction 22/7. We don’t write our date that way, we write it as 7/22. In other parts of the world it is written as 22/7. So whichever way you slice it, it’s a pi day and in Northern Michigan I would imagine it’s a cherry pi. In the sky today the planet Mercury is at its greatest elongation or separation east of the Sun in the western sky. It is preceding the Sun heading southward against the stars and is not easily visible after sunset.

The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EDT, UT–4 hours). They may be different for your location.

* In the radio program I called it Pi Day #2. I have since found out that today has a special name.

Addendum

Illustrating the value of π with 29 plastic straw sections: seven across the diameter and 22 around the circumference. The source for this illustration is a website called Toys from Trash (http://arvindguptatoys.com/)
Illustrating the value of π with 29 plastic straw sections: seven across the diameter and 22 around the circumference. The source for this illustration is a website called Toys from Trash (http://arvindguptatoys.com/) based in India showing many illustrations of toys and things related to STEM, including astronomy, that can be made. I highly recommend it.

Ephemeris: 03/29/2024 – Calculating the date of Easter

March 29, 2024 Comments off

This is Ephemeris for Good Friday, March 29th. Today the Sun will be up for 12 hours and 39 minutes, setting at 8:07, and it will rise tomorrow at 7:26. The Moon, 3 days before last quarter, will rise at 1:09 tomorrow morning.

Easter will be celebrated by Western Christian churches this Sunday. Easter is a movable feast in that it falls on a different date each year following the first full moon of spring. It was an attempt to follow the Jewish Passover, which starts on the 15th of the month of Nisan. The Jewish calendar being a lunar calendar, the 15th is generally the night of the full moon, sometimes called the Paschal Full Moon. And since the Last Supper was a Seder, according to at least one Gospel, the Christian church wanted to link Easter with Passover as closely as possible using the Roman solar based (Julian) calendar. That’s not always the case, especially with our current Gregorian Calendar. Passover this year begins at sunset April 22nd because the Jewish lunar calendar is tied to the Julian Calendar.

The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EDT, UT–4 hours). They may be different for your location.

Addendum

Ostara (Oestre) by Johannes Gehrts  (1855–1921)
This is the Germanic goddess of spring and dawn Oestre, from whose name we get the word Easter. Since the dawn arrives from the east, I think the word East comes from her name too. As far as I’ve checked the name of the feast of the Resurrection is related to the Passover in most other Euopean countries. Credit: Ostara (Oestre) by Johannes Gehrts  (1855–1921), via Wikipedia.

Ephemeris: 03/14/2024 – It’s Pi Day!

March 14, 2024 Comments off

This is Ephemeris for Pi Day, Thursday, March 14th. Today the Sun will be up for 11 hours and 52 minutes, setting at 7:48, and it will rise tomorrow at 7:54. The Moon, 3 days before first quarter, will set at 1:47 tomorrow morning.

Yes, it’s Pi day that’s the Greek letter π for 3.14 approximating the ratio of the circle’s circumference to its diameter, which scientific and technical people celebrate by baking a pie P-I-E and carving the Greek letter π on the top.

Tonight around 9 or 9:30 when it gets dark, is a good time to use the Moon to find the Pleiades, the Seven Sisters star cluster. The Pleiades will appear above the crescent Moon this evening, so it’s a good time to locate them if you haven’t already. We only have about another month viewing the Pleiades in the evening. And we have one more passage of the Moon by the Pleiades next month before they disappear from the evening sky.

The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EDT, UT–4 hours). They may be different for your location.

Addendum

Have a slice of Pi Day pie
Here’s a link to NASA’s Pi Day Challenge: https://www.jpl.nasa.gov/edu/nasapidaychallenge/. This link also has a link for educators for STEM related challenges.
There’s another Pi day that some celebrate. A well-known approximation of pi is the fraction 22/7ths. Europeans and others write dates in day/month order, so July 22nd is also a Pi Day: 22/7.
The moon and the Pleiades as they might be seen this evening in binoculars at 9:00 PM . Jupiter will continue to approach the Pleiades until it sets at 1:44 AM. For locations west of us (Michigan) Jupiter will get even closer. Created using Stellarium.

02/10/2023 – Ephemeris – Finding Orion’s greater hunting dog, Canis Major

February 10, 2023 Comments off

This is Bob Moler with Ephemeris for Friday, February 10th. Today the Sun will be up for 10 hours and 13 minutes, setting at 6:04, and it will rise tomorrow at 7:49. The Moon, 3 days before last quarter, will rise at 11:14 this evening.

The great winter constellation or star group, Orion the hunter, is located in the southern sky at 9 p.m. His elongated rectangle of a torso is vertical. In the center of the rectangle are three stars in a line that make his belt. As a hunter, especially one of old, he has two hunting dogs. The larger, Canis Major, can be found by following the three belt stars of Orion down and to the left. They point to Sirius, the brightest nighttime star, also known as the Dog Star. It’s in the heart of a stick figure dog low in the southeast facing Orion that appears to be begging. There’s a fine star cluster, called Messier, or M 41, at the 5 o’clock position from Sirius. It’s easily visible in binoculars or a small telescope.

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

Orion and Canis Major

Orion and Canis Major animation for earlier than 9 in the evening. Created using Stellarium and GIMP.

10/10/2022 – Ephemeris – Indigenous Peoples Day

October 10, 2022 Comments off

This is Ephemeris for Indigenous Peoples Day, Monday, October 10th. Today the Sun will be up for 11 hours and 14 minutes, setting at 7:06, and it will rise tomorrow at 7:53. The Moon, 1 day past full, will rise at 7:39 this evening.

Today the United States celebrates Columbus Day, a Monday near the date Christopher Columbus landed on a Caribbean island, and found people who got there at least 15 thousand years earlier. Due to superior technology, and nothing else really, the Europeans conquered the peoples of the continents they called the Americas, deeming the indigenous peoples, incorrectly, as savages. My astronomical journey started with learning the constellations and stories from the ancient Greeks. About twelve years ago I began to investigate the constellations and stories of the Anishinaabe peoples, whose ancestral lands we live on, which turn out to be as rich and meaningful as those I learned in my youth from the Old World.

The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EDT, UT – 4 hours). They may be different for your location.

Addendum

Proclamation by Governor Whitmer:

October 10, 2022: Indigenous Peoples’ Day

WHEREAS, the idea of Indigenous Peoples’ Day was first proposed in 1977 by a delegation of Native Nations to the United Nations-sponsored International Conference on Discrimination Against Indigenous Populations in the Americas; and,

WHEREAS, in 1990, representatives from 120 Indigenous Nations at the First Continental Conference on 500 Years of Indian Resistance unanimously passed a resolution to transform Columbus Day into an opportunity to reveal historic truths about pre-existing Indigenous cultures and Peoples that have survived a colonization process, most often violent, and continue to exist and thrive in present day America; and,

WHEREAS, the United States endorsed the United Declaration on the Rights of Indigenous Peoples on December 16, 2010, and Article 15 of that declaration states:

  • Indigenous Peoples have the right to the dignity and diversity of their cultures, traditions, histories, and aspirations, which shall be appropriately reflected in education and public information.
  • States should take effective measures, in consultation and cooperation with the Indigenous Peoples concerned, to combat prejudice and eliminate discrimination and to promote tolerance, understanding, and good relations among Indigenous Peoples and all other segments of society; and,

WHEREAS, the state of Michigan recognizes the presence of the three major tribal groups in our state today, the Chippewa (Ojibwe), Ottawa (Odawa), and Potawatomi (Bodéwadmik), who have lived upon this land since time immemorial, and values the progress our society has accomplished through Native American thought, culture, and contributions; and,

WHEREAS, many communities and municipalities in the land we now call Michigan have passed resolutions to officially recognize Indigenous Peoples’ Day on the second Monday in October; and,

WHEREAS, the resolution states that Indigenous Peoples’ Day shall be used to reflect upon the ongoing struggles of Indigenous Peoples on this land and to celebrate the thriving cultures and values that the Odawa, Ojibwe, Bodéwadmik, and other Indigenous Peoples contribute to society; and,

WHEREAS, on this second Monday of October, we should honor the historic, cultural, and contemporary significance of Indigenous Peoples and their ancestral lands that also became known as the Americas and celebrate their contributions to communities throughout the land we now call Michigan, the United States, and all over the world;

NOW, THEREFORE, I, Gretchen Whitmer, governor of Michigan, do hereby proclaim October 10, 2022, as Indigenous Peoples’ Day in Michigan to uplift our country’s Indigenous roots, history, and contributions.

Anishinaabe North America is Turtle Island

The Anishinaabe, of which the Ojibwe, Odawa, and Potawatomi are a part, see North America as Turtle Island

03/08/2022 – Ephemeris – International Women’s Day

March 8, 2022 Comments off

This is Ephemeris for International Women’s Day, Tuesday, March 8th. Today the Sun will be up for 11 hours and 32 minutes, setting at 6:39, and it will rise tomorrow at 7:06. The Moon, 2 days before first quarter, will set at 1:25 tomorrow morning.

The planet Venus is the only major planet named after a goddess. Satellites of the planets are named after both male and female deities. When asteroids were discovered between Mars and Jupiter they began to receive female deity names, however errant asteroids that that came close to the Earth’s orbit received male names. Venus, named after the Roman goddess of love, by convention, has female names for its land forms. But before that convention was adopted the first bright radar feature found on Venus, in 1967, was Maxwell Montes, named after James Clerk Maxwell whose work in the 19th century predicted radio waves. It is by reflected radio waves (radar) by which that feature had been found using the Arecibo radio telescope.

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 Map

Radar map of Venus produced by the radar altimeter of the Pioneer Venus Orbiter, 1978-1992. Note Maxwell Montes at the top, part of Ishtar Terra, a continent-like land mass. Another large land mass is Aphrodite Terra in the center right. Click on the image to enlarge it.  Credit: NASA.

04/12/2021 – Ephemeris – Human space flight began 60 years ago today

April 12, 2021 Comments off

This is Bob Moler with Ephemeris for Monday, April 12th. Today the Sun will be up for 13 hours and 21 minutes, setting at 8:24, and it will rise tomorrow at 7:01. The Moon, 1 day past new, will set at 9:05 this evening.

60 years ago today Yuri Gagarin a Soviet Air Force pilot became the first cosmonaut and first person to orbit the Earth in his Vostok-1 spacecraft. The event has been celebrated around the world since 2001 as Yuri’s Night. Gagarin was strictly a passenger on his flight, but was given a key to override the automated functions of the spacecraft to take over manually if needed. He ejected from the capsule as planned to land by parachute. His flight came three weeks before the United States and NASA launched Alan Shepard on his sub-orbital flight in his Freedom 7 Mercury Capsule on May 5th 1961. It wasn’t until February 20th the next year that John Glenn made three orbits of the Earth in his Friendship 7 Capsule to match Gagarin’s feat.

The astronomical event times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.

Addendum

Yuri Gagarin in space helmet
Yuri Gagarin in his space suit and helmet.
Vostok-1 rocket at launch
Vostok-1 rocket at launch carrying Yuri Gagarin on his single orbit of the Earth. The current Soyuz rocket is a direct descendant of the R-7 used for Yuri Gagarin’s flight and the Soviet’s first ICBM.
Vostok capsule upopn landing
The Vostok capsule upon landing. Gagarin was ejected from the capsule at 7 kilometers altitude to land with his own parachute rather than trying to survive a rough hard earth landing in the capsule.
Yuri's Night logo
Yuri’s Night logo