Home > The Moon > 02/06/2014 – Ephemeris – The moon tonight and libration

02/06/2014 – Ephemeris – The moon tonight and libration

February 6, 2014

Ephemeris for Thursday, February 6th.  The sun will rise at 7:55.  It’ll be up for 10 hours and 3 minutes, setting at 5:58.   The Moon, at first quarter today, will set at 2:11 tomorrow morning.

The Moon, being at first quarter today, has the terminator or sunrise line cut the Moon in half tonight.  In binoculars and telescopes the best detail is seen near the terminator where the shadows are longest.  The farther one wanders with a telescope the flatter the terrain appears.  There’s another effect that can be seen.  It’s called libration where the Moon appears to slowly wobble during the month.  This is mostly caused by the Moon’s very steady rotation countered by the fact that the Moon’s orbit is elliptical and gets ahead or behind the rotation.  At the upper right of the Moon is the small Sea of Crises.  That has rotated forward a bit revealing yet another sea at the edge of the Moon, Mare Marginis, the Margin or Border Sea.

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

Addendum

The Moon

The Moon highlighting the Ephemeris topics at 9 p.m. on February 6, 2014. Created using Virtual Moon Atlas.

The Moon

The Moon highlighting the Ephemeris topics at 9 p.m. on February 6, 2014. Created using Virtual Moon Atlas.

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