Archive for January 25, 2018

01/25/2018 – Ephemeris – The Moon tonight: Copernicus on the terminator

January 25, 2018 Comments off

Ephemeris for Thursday, January 25th. The Sun will rise at 8:09. It’ll be up for 9 hours and 32 minutes, setting at 5:41. The Moon, 1 day past first quarter, will set at 2:48 tomorrow morning.

Let’s take a look at our slightly gibbous moon, just a day past first quarter with binoculars or a small telescope. The terminator, in this case the sunrise line will appear to cross the crater Copernicus to the right of the Moon’s center if you’re viewing it right side up. To the North across the Sea of Showers, or Mare Imbrium is the large flat floored crater Plato. South of Copernicus is a recently named sea, Mare Cognitum, the Known Sea, after the first successful close photography by the Ranger 7 spacecraft in 1964. South of the is Mare Nubium, the Sea of Clouds. South of that are the lunar highlands with the stark crater Tycho and the huge crater Clavius with an arc of craters of decreasing size within it.

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


The Moon tonight

The waxing gibbous Moon tonight at 8 p.m., January 25, 2018. Created using Virtual Moon Atlas.

The crater Copernicus. Credit: NASA/GSFC/Arizona State University.

The crater Copernicus. Credit: NASA/GSFC/Arizona State University.

Lunar highlands

The Lunar highlands near the crater Tycho showing a surface saturated with craters. Credit: Virtual Moon Atlas with the texture from NASA’s Lunar Reconnaissance Orbiter. The lunar phase was omitted.


Clavius as photographed by one of the Lunar Orbiter spacecraft in the 1960s From Digital Lunar Orbital Photographic Atlas. Credit Jeff Gillis, Lunar and Planetary Institute.