Home > Anishinaabe Constellation, Ephemeris Program, The Moon > 02/20/2018 – Ephemeris – Tonight’s the night to spot a chain of three of my favorite craters

02/20/2018 – Ephemeris – Tonight’s the night to spot a chain of three of my favorite craters

February 20, 2018

Ephemeris for Tuesday, February 20th. The Sun will rise at 7:35. It’ll be up for 10 hours and 43 minutes, setting at 6:18. The Moon, 3 days before first quarter, will set at 11:29 this evening.

I was a day off in my Moon calculations yesterday. The three of my favorite craters, just south of the partially illuminated Sea of Tranquility will be visible tonight. From north to south or top to bottom, near the terminator or sunrise line is Theophilus, which slightly overlaps the crater wall of Cyrillus, then a bit farther south another older crater Catharina. These craters were named by a Jesuit astronomer Giovanni Battista Riccioli (Ri’cholli). He even named a crater Copernicus, even though he followed the Church teachings of the time he didn’t believe in the Copernican Sun centered system, but the system put forth by Danish astronomer Tycho Brahe where the Moon and Sun circled the Earth, but the other planets circled the Sun.

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


Crescent Moon

The crescent Moon on the evening of February 20th, 2018. showing the craters discussed in the test. Created using Virtual Moon Atlas and rotated to approximate its orientation in the sky after sunset.

Repeating from yesterday:  For anyone east of here who can see the Moon at 19:00 UT, on the 20th should see Theophilus shadow filled with the crater rim and the central peak poking into sunlight.  It should be visible from Europe and the Mid East.  Let me know with a comment if I guessed right.

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