12/03/2019 – Ephemeris – The Moon tonight

Ephemeris for Tuesday, December 3rd. Today the Sun will be up for 9 hours and 1 minute, setting at 5:03, and it will rise tomorrow at 8:02. The Moon, 1 day before first quarter, will set at midnight.

The Moon tonight is a few hours before being at first quarter, when the Moon appears exactly half illuminated. In viewing the Moon with a pair of binoculars or a telescope the observer will notice that the best detail is seen near the terminator, the sunrise line, that’s cutting the Moon in half. That’s where the shadows are longest. The large gray feature at the upper right of the Moon is Mare Serenitatis, which translates to the Sea of Serenity. To me it appears to look like a scallop shell. Serenitatis like most other seas is roughly circular and is actually a crater, the result of an impact of a large asteroid during what is called the late heavy bombardment that happened about 4 billion years ago.

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

Addendum

The moon as will appear tonight at 8 p.m. December 3, 2019 EST. Moon image credit NASA Scientific Visualization Studio.

Images of the moon’s phase for the entire year are available from https://svs.gsfc.nasa.gov/4442.

Image of a scallop shell rotated to match the Sea of Serenity. Credit Wikipedia user Kevmin. (Creative Commons)

08/13/2013 – Ephemeris – Highs and lows on the moon

Ephemeris for Tuesday, August 13th.  The sun rises at 6:43.  It’ll be up for 14 hours and 7 minutes, setting at 8:50.   The moon, 1 day before first quarter, will set at 12:04 tomorrow morning.

The moon passed Saturn a couple of hours ago while they were below the horizon.  By this evening the moon will be to the left of Saturn.  In each 24 hour period the moon moves about 24 times its diameter against the stars, or its own width in an hour. Looking at the moon tonight with binoculars or a telescope, the Sea of Serenity or Mare Serenitatis dominates the moon’s upper right quadrant.  To me its shaped like a scallop shell.  On the bottom part of the moon are the lunar highlands, bright and saturated with craters large and small.  The highlands are really high, while the sea’s like Serenity are low.  Should the moon have an atmosphere and water, the seas would be real, not just lava filled plains.

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

Addendum

The Moon 1 day before first quarter. Created usinf Virtual Moon Atlas.