Archive
Ephemeris: 03/31/2026 – Previewing April Skies
This is Ephemeris for Tuesday, March 31st. Today the Sun will be up for 12 hours and 43 minutes, setting at 8:09, and it will rise tomorrow at 7:23. The Moon, 1 day before full, will set at 7:00 tomorrow morning.
The 4th month of the year begins tomorrow. Daylight hours in the Interlochen/Traverse City area will increase from 12 hours and 47 minutes tomorrow to 14 hours and 12 minutes on April 30th. The altitude, or angle, of the Sun above the southern horizon at local noon will be 50 degrees tomorrow and will ascend to 60 degrees on April 30th. The altitude of the Sun in the Straits area will be a degree lower, but their daylight hours will be a bit longer. The actual time of local apparent noon, when the Sun passes due south at mid-month, will be about 1:42 PM. The Lyrid meteor shower will reach its peak on the afternoon of the 22nd. So the hours after 2 or 3 AM on the 22nd and 23rd will be the best time to see them in dark skies.
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
April Evening Star Chart
The planets and stars are plotted for the 15th at 10 PM EDT in the evening and 5 AM for the morning chart. These are the chart times. Note that Traverse City is located approximately 45 minutes behind our time meridian. (An hour 45 minutes behind our daylight saving time meridian during EDT). To duplicate the star positions on a planisphere (rotating star finder) you may have to set it to 45 minutes or one hour 45 minutes (Daylight Time) earlier than the current time.
Note the chart times of 10 PM and 6 AM are for the 15th and 16th. For each week before these dates, add ½ hour (28 minutes if you’re picky). For each week after, subtract ½ hour. Planet positions on dates other than the 15/16th can be found in the Wednesday planet posts on this blog.
April Morning Star Chart
Twilight Limits, Nautical and Astronomical
| EDT | |||||||
| Morning | Twilight | Evening | Twilight | Dark | Night | Moon | |
| Date | Astro. | Nautical | Nautical | Astro. | Start | End | Illum. |
| 2026-04-01 | 5h43m | 6h19m | 21h17m | 21h54m | – | – | 100% |
| 2026-04-02 | 5h41m | 6h17m | 21h19m | 21h56m | – | – | 99% |
| 2026-04-03 | 5h39m | 6h15m | 21h20m | 21h57m | 21h57m | 22h23m | 96% |
| 2026-04-04 | 5h36m | 6h13m | 21h22m | 21h59m | 21h59m | 23h30m | 91% |
| 2026-04-05 | 5h34m | 6h11m | 21h23m | 22h00m | 22h00m | – | 85% |
| 2026-04-06 | 5h32m | 6h09m | 21h24m | 22h02m | 22h02m | 0h36m | 77% |
| 2026-04-07 | 5h30m | 6h07m | 21h26m | 22h04m | 22h04m | 1h38m | 69% |
| 2026-04-08 | 5h28m | 6h05m | 21h27m | 22h05m | 22h05m | 2h34m | 60% |
| 2026-04-09 | 5h25m | 6h03m | 21h29m | 22h07m | 22h07m | 3h20m | 50% |
| 2026-04-10 | 5h23m | 6h02m | 21h30m | 22h08m | 22h08m | 3h58m | 41% |
| 2026-04-11 | 5h21m | 6h00m | 21h32m | 22h10m | 22h10m | 4h29m | 31% |
| 2026-04-12 | 5h19m | 5h58m | 21h33m | 22h12m | 22h12m | 4h54m | 22% |
| 2026-04-13 | 5h17m | 5h56m | 21h35m | 22h14m | 22h14m | 5h16m | 14% |
| 2026-04-14 | 5h14m | 5h54m | 21h36m | 22h15m | 22h15m | 5h14m | 7% |
| 2026-04-15 | 5h12m | 5h52m | 21h38m | 22h17m | 22h17m | 5h12m | 2% |
| 2026-04-16 | 5h10m | 5h50m | 21h39m | 22h19m | 22h19m | 5h10m | 0% |
| 2026-04-17 | 5h08m | 5h48m | 21h41m | 22h21m | 22h21m | 5h08m | 1% |
| 2026-04-18 | 5h06m | 5h46m | 21h42m | 22h22m | 22h43m | 5h06m | 4% |
| 2026-04-19 | 5h03m | 5h44m | 21h44m | 22h24m | – | 5h03m | 11% |
| 2026-04-20 | 5h01m | 5h42m | 21h45m | 22h26m | 0h06m | 5h01m | 19% |
| 2026-04-21 | 4h59m | 5h40m | 21h47m | 22h28m | 1h20m | 4h59m | 29% |
| 2026-04-22 | 4h57m | 5h38m | 21h48m | 22h30m | 2h21m | 4h57m | 40% |
| 2026-04-23 | 4h54m | 5h36m | 21h50m | 22h31m | 3h08m | 4h54m | 51% |
| 2026-04-24 | 4h52m | 5h34m | 21h51m | 22h33m | 3h42m | 4h52m | 62% |
| 2026-04-25 | 4h50m | 5h32m | 21h53m | 22h35m | 4h09m | 4h50m | 72% |
| 2026-04-26 | 4h48m | 5h30m | 21h54m | 22h37m | 4h30m | 4h48m | 81% |
| 2026-04-27 | 4h46m | 5h29m | 21h56m | 22h39m | – | – | 88% |
| 2026-04-28 | 4h43m | 5h27m | 21h57m | 22h41m | – | – | 94% |
| 2026-04-29 | 4h41m | 5h25m | 21h59m | 22h43m | – | – | 98% |
| 2026-04-30 | 4h39m | 5h23m | 22h01m | 22h45m | – | – | 100% |
Twilight calendar was generated using Cartes du Ciel (Sky Charts).
See my blog post: Twilight Zone for the definitions of the different periods of twilight here: https://bobmoler.wordpress.com/2019/09/27/
NASA Calendar of Planetary Events
Apr 1 We Venus: 20.5° E
1 We 10:12 PM Full Moon
2 Th 9:32 PM Moon-Spica: 1.9° N
3 Fr 6:59 PM Mercury Elongation: 27.8° W
6 Mo 3:21 PM Moon-Antares: 0.7° N
7 Tu 4:32 AM Moon Apogee: 405000 km
8 We 1:01 AM Moon South Dec.: 28.3° S
10 Fr 12:52 AM Last Quarter
13 Mo 7:43 PM Moon Ascending Node
15 We 8:45 PM Moon-Mars: 3.8° S
17 Fr 7:52 AM New Moon
19 Su 2:57 AM Moon Perigee: 361600 km
19 Su 4:48 AM Moon-Venus: 4.7° S
19 Su 12:28 PM Moon-Pleiades: 1° S
19 Su 3:04 PM Mars-Saturn: 1.2° N
20 Mo 5:41 AM Mercury-Saturn: 0.5° N
20 Mo 6:15 PM Mercury-Mars: 1.7° N
21 Tu 7:12 AM Moon North Dec.: 28.2° N
22 We 3:02 PM Lyrid Shower: ZHR = 20
22 We 6:06 PM Moon-Jupiter: 3.6° S
23 Th 10:32 PM First Quarter
24 Fr 12:15 AM Venus-Pleiades: 3.5° S
24 Fr 3:46 AM Moon-Beehive: 1.1° S
25 Sa 8:37 PM Moon-Regulus: 0.2° S (Occultation possibility)
26 Su 10:36 AM Moon Descending Node
30 Th 4:17 AM Moon-Spica: 2° N
May 1 Fr Venus: 27.8° E
Sky Events Calendar by Fred Espenak and Sumit Dutta (NASA’s GSFC),
http://eclipse.gsfc.nasa.gov/SKYCAL/SKYCAL.html
If you go to the above site you can print out a list like the above for the entire year or calendar pages for your time zone.
Sun and Moon Rising and Setting Events
LU Ephemeris of Sky Events for Interlochen/TC
April, 2026 Local time zone: EDT
+-----------------------------------------------------------------------+
| DATE | SUN SUN DAYLIGHT| TWILIGHT* |MOON RISE OR ILLUM |
| | RISE SET HOURS | END START |PHASE SET** TIME FRACTN|
+=======================================================================+
|Wed 1| 07:23a 08:10p 12:47 | 09:15p 06:18a |Full Rise 08:06p 100%|
|Thu 2| 07:21a 08:11p 12:50 | 09:16p 06:16a | Rise 09:14p 99%|
|Fri 3| 07:19a 08:13p 12:53 | 09:18p 06:14a | Rise 10:22p 96%|
|Sat 4| 07:17a 08:14p 12:56 | 09:19p 06:12a | Rise 11:30p 92%|
+------+-----------------------+----------------+-----------------------+
|Sun 5| 07:16a 08:15p 12:59 | 09:21p 06:10a | Rise 12:36a 86%|
|Mon 6| 07:14a 08:16p 13:02 | 09:22p 06:08a | Rise 01:38a 79%|
|Tue 7| 07:12a 08:18p 13:05 | 09:23p 06:06a | Rise 02:33a 70%|
|Wed 8| 07:10a 08:19p 13:08 | 09:25p 06:04a | Rise 03:20a 61%|
|Thu 9| 07:08a 08:20p 13:11 | 09:26p 06:02a | Rise 03:58a 52%|
|Fri 10| 07:07a 08:21p 13:14 | 09:28p 06:00a |L Qtr Rise 04:29a 42%|
|Sat 11| 07:05a 08:23p 13:17 | 09:29p 05:58a | Rise 04:54a 33%|
+------+-----------------------+----------------+-----------------------+
|Sun 12| 07:03a 08:24p 13:20 | 09:31p 05:57a | Rise 05:16a 23%|
|Mon 13| 07:01a 08:25p 13:23 | 09:32p 05:55a | Rise 05:35a 15%|
|Tue 14| 07:00a 08:26p 13:26 | 09:34p 05:53a | Rise 05:55a 8%|
|Wed 15| 06:58a 08:28p 13:29 | 09:35p 05:51a | Rise 06:15a 3%|
|Thu 16| 06:56a 08:29p 13:32 | 09:37p 05:49a | Rise 06:38a 0%|
|Fri 17| 06:54a 08:30p 13:35 | 09:38p 05:47a |New Set 09:17p 1%|
|Sat 18| 06:53a 08:31p 13:38 | 09:40p 05:45a | Set 10:42p 3%|
+------+-----------------------+----------------+-----------------------+
|Sun 19| 06:51a 08:33p 13:41 | 09:41p 05:43a | Set 12:05a 9%|
|Mon 20| 06:49a 08:34p 13:44 | 09:43p 05:41a | Set 01:20a 17%|
|Tue 21| 06:48a 08:35p 13:47 | 09:44p 05:39a | Set 02:21a 27%|
|Wed 22| 06:46a 08:36p 13:50 | 09:46p 05:37a | Set 03:07a 38%|
|Thu 23| 06:45a 08:37p 13:52 | 09:47p 05:35a |F Qtr Set 03:42a 49%|
|Fri 24| 06:43a 08:39p 13:55 | 09:49p 05:33a | Set 04:08a 60%|
|Sat 25| 06:41a 08:40p 13:58 | 09:50p 05:31a | Set 04:30a 70%|
+------+-----------------------+----------------+-----------------------+
|Sun 26| 06:40a 08:41p 14:01 | 09:52p 05:29a | Set 04:49a 79%|
|Mon 27| 06:38a 08:42p 14:04 | 09:53p 05:28a | Set 05:06a 87%|
|Tue 28| 06:37a 08:44p 14:07 | 09:55p 05:26a | Set 05:24a 93%|
|Wed 29| 06:35a 08:45p 14:09 | 09:57p 05:24a | Set 05:42a 97%|
|Thu 30| 06:34a 08:46p 14:12 | 09:58p 05:22a | Set 06:03a 99%|
+-----------------------------------------------------------------------+
* Nautical Twilight
** Moonrise or moonset, whichever occurs between sunset and sunrise
Created using my LookingUp for MS-DOS app.
Ephemeris: 03/30/2026 – Have I ever seen a UFO?
This is Ephemeris for Monday, March 30th. Today the Sun will be up for 12 hours and 40 minutes, setting at 8:08, and it will rise tomorrow at 7:25. The Moon, 2 days before full, will set at 6:42 tomorrow morning.
I’ve been asked whether I’ve ever seen a UFO. UFO stands for unidentified flying object, and based on the actual term it means that you don’t know what it is. The term UFO has come to mean alien spacecraft, but there’s no proof of that. I’ve seen things in the sky I could not immediately identify, but within a few minutes of observation or thinking about it, was able to find a plausible explanation for it. I haven’t seen anything that couldn’t be explained by being manmade or natural. The last time I saw something weird in the sky was a number of years ago during a star party at the Sleeping Bear Dunes National Lakeshore. A solid line of light silently moved northward through the sky. After a bit it dawned on me that the previous day SpaceX launched their first batch of Starlink satellites. They hadn’t separated far yet.
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; EST, UT – 5 hours) unless stated otherwise. Times will be different for other locations.
Addendum
Ephemeris: 03/27/2026 – Finding life out there
This is Ephemeris for Friday, March 27th. Today the Sun will be up for 12 hours and 31 minutes, setting at 8:04, and it will rise tomorrow at 7:30. The Moon, 2 days past first quarter, will set at 5:39 tomorrow morning.
I have often been asked what I thought about life existing in the universe… besides the Earth of course. My answer is yes, I think there is life out there in the universe. There are more galaxies, stars and planets than we can possibly count, though when looking at exoplanets, we’re not finding much in the way of habitable planets. We have one example of life: the Earth and that’s what we look for. Our detection methods are too crude to be able to detect anything as small as the earth unless it’s orbiting a small red dwarf star. We seem to find a lot of large planets, that orbit extremely close to their stars because our detection methods depend on what they do to either block the light of a star or affect it gravitationally. The earth is almost too small to do either.
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; EST, UT – 5 hours) unless stated otherwise. Times will be different for other locations.
Addendum
Ephemeris: 03/26/26 – Jupiter compared to Earth and its visible features
This is Bob Moler with Ephemeris for Thursday, March 26th. Today the Sun will be up for 12 hours and 28 minutes, setting at 8:03, and it will rise tomorrow at 7:32. The Moon, 1 day past first quarter, will set at 5:07 tomorrow morning. | The planet Jupiter rules over the night sky with the Moon after Venus sets. Jupiter, 11 times the diameter of the Earth, has the volume of 1,300 earths, however it is only 318 times the mass of the Earth. It is made-up mostly of hydrogen and helium, so it is called a gas giant planet, rather than a terrestrial or rocky planet like the Earth. Jupiter is the most viewable of the planets in a small telescope. It has 2 dark bands across it called belts of darker appearing clouds. The famed Great Red Spot is an anticyclone embedded in the southern of those belts. The spot is not as red anymore. I remember it being brick-red back in the late 1950s and early 60s. Jupiter spins very rapidly, its day lasts only 10 hours.
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.
Ephemeris: 03/25/2026 – Taking our weekly look at the whereabouts of the naked-eye planets
This is Ephemeris for Wednesday, March 25th. Today the Sun will be up for 12 hours and 25 minutes, setting at 8:01, and it will rise tomorrow at 7:34. The Moon, at first quarter today, will set at 4:26 tomorrow morning.
Let’s take our weekly look at the whereabouts of the naked-eye planets. Earlier this morning Saturn passed conjunction with the Sun becoming officially a morning planet. But it’ll be a couple of months before it’s visible in the morning and about seven months before it’s conveniently placed in the evening sky. By 8:30 PM tonight or about a half hour or so after sunset, Venus may be seen very low in the West. Binoculars or a telescope will show a very tiny disc on Venus, because it is pretty much behind the Sun, a good way from us. Over the next 7 months it will be moving closer to us and becoming much larger. Jupiter is the brilliant star-like object more than halfway up in the southwestern sky at 9 PM. Tonight, it’s below and left of the Moon.
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; EST, UT – 5 hours) unless stated otherwise. Times will be different for other locations.
Addendum
Ephemeris: 03/24/2026 – Visibility of the Moon’s features
This is Ephemeris for Tuesday, March 24th. Today the Sun will be up for 12 hours and 22 minutes, setting at 8:00, and it will rise tomorrow at 7:36. The Moon, 1 day before first quarter, will set at 3:31 tomorrow morning.
The Moon, tonight is just a day before first quarter. Its position in the sky is close to where the Sun will be around the 1st day of summer, so it’s quite high in the southwest as it gets dark. It’s a great time to view the Moon with the telescope, in that the moon isn’t too bright, and there are lots of craters showing up due to their shadows. The terminator nearly cuts the Moon in half. It is in this case, the sunrise line creeping across the surface. It is deep morning shadows that help delineate the features. Looking at the limb of the Moon, the curved edge, the craters are hard to spot, because they are under the midday sun, showing no shadows, which makes them very indistinct.
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; EST, UT – 5 hours) unless stated otherwise. Times will be different for other locations.
Addendum
Ephemeris: 03/23/2026 – Looking out beyond the spring stars
This is Ephemeris for Monday, March 23rd. Today the Sun will be up for 12 hours and 19 minutes, setting at 7:59, and it will rise tomorrow at 7:38. The Moon, 2 days before first quarter, will set at 2:23 tomorrow morning.
It is becoming more obvious as the Moon waxes, that there’s more bright stars in the south and southwestern part of the sky than there are in the southeastern sky. That’s because the Milky Way runs through the winter part of the sky. It’s not as bright as the Milky Way appears in the summer since we are looking away from the center of our Galaxy. The disk of our galaxy causes stars to congregate near that Milky band, whether we can see it well or not. That is the main reason the winter stars are so bright. In the southeast we are looking at the spring sky. Leo the lion and of course the Great Bear with the Big Dipper are there, but we are mostly looking outside the disk or galaxy to the universe beyond. So we’re looking through fewer nearby stars, so the spring sky seems somewhat lackluster compared to the crazy chaos of the winter sky.
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; EST, UT – 5 hours) unless stated otherwise. Times will be different for other locations.
Addendum
Ephemeris: 03/20/2026 – Spring begins today!
This is Ephemeris for Friday, March 20th. Today the Sun will be up for 12 hours and 9 minutes, setting at 7:55, and it will rise tomorrow at 7:43. The Moon, 2 days past new, will set at 10:21 this evening.
At 10:46 AM today the season of spring will begin. It may or may not feel it in our neck of the woods, but astronomically at that time the Sun will appear to cross a point in the sky called the vernal equinox. Equinox means equal night, when the Sun is up for 12 hours, and set for 12 hours. It does, if you don’t look too closely, and in the old days clocks weren’t that accurate anyway. The vernal equinox is the point in the sky where the Sun crosses the celestial equator, which is above the Earth’s equator heading north. The North Pole will begin 6 months of daylight, while the rest of the Northern Hemisphere will bask in more than 12 hours of sunlight a day. The reverse is true in the Southern Hemisphere where autumn will start.
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; EST, UT – 5 hours) unless stated otherwise. Times will be different for other locations.
Addendum
Ephemeris: 03/19/2026 – Anticipating the beginning of spring
See Aurora alert below
This is Ephemeris for Thursday, March 19th. Today the Sun will be up for 12 hours and 6 minutes, setting at 7:54, and it will rise tomorrow at 7:45. The Moon, 1 day past new, will set at 9:02 this evening.
This is the last full day of winter. It seems strange that we know so accurately when the seasons begin and end astronomically, but never know what the weather’s going to do tomorrow with that same accuracy. The main reason is the number of variables involved. With the solar system, the earth and the sun in particular. There are very few variables. For instance, the masses of the Earth and the Sun, they’re distance apart and the gravitational constant, will give you a very close approximation. For the weather, there are tons of variables, plus what a butterfly did in Alaska last October. Knowing the date of the vernal equinox the first day of spring was and is important for agriculture, knowing when the world will warm up again.
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; EST, UT – 5 hours) unless stated otherwise. Times will be different for other locations.
Addendum
Aurora Alert
According to Spaceweather.com the Earth will be hit with 2 CMEs (Coronal Mass Ejections) from the Sun on the 19th and 21st respectively. See also NOAA’s Space Weather Prediction Center.
Ephemeris: 03/18/2026 – Taking our weekly look at the whereabouts of the naked-eye planets
This is Ephemeris for Wednesday, March 18th. Today the Sun will be up for 12 hours and 3 minutes, setting at 7:52, and it will rise tomorrow at 7:47. The Moon is new today, and won’t be visible.
Let’s take our weekly look at the whereabouts of the naked-eye planets. By 8:30 PM or about a half hour or so after sunset, Venus may be seen very low in the West. Binoculars or a telescope will show a very tiny disc on Venus, because it is pretty much behind the Sun, a good way from us. However over the next 7 months it will be moving closer to us and becoming much larger. Jupiter is the brilliant star-like object more than halfway up in the southern sky at 9 PM. It’s the brightest object in the sky at that point. It has resumed its normal eastward motion, spending most of its evening appearance making up the ground it lost in its 4 months of retrograde motion. The planet and its moons are a treat for binoculars or a telescope.
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; EST, UT – 5 hours) unless stated otherwise. Times will be different for other locations.
Addendum
Bob Moler's Ephemeris Blog 