Home > Ephemeris Program, The Moon > 05/10/2016 – Ephemeris – The lunar Sea of Crises

05/10/2016 – Ephemeris – The lunar Sea of Crises

May 10, 2016

Ephemeris for Tuesday, May 10th.  The Sun rises at 6:19.  It’ll be up for 14 hours and 39 minutes, setting at 8:59.  The Moon, 3 days before first quarter, will set at 1:04 tomorrow morning.

Tonight the Moon shows one remarkable sea:  Mare Crisium or the Sea of Crises.  It is a large gray basin.  The largest feature visible in binoculars.  Because it’s near the Moon’s limb or edge it is foreshortened into an ellipse, with the long axis running north and south.  In actuality it is elliptical with the long axis east and west.  It looks funny on a geologic map of the whole moon or a Moon globe.  Its dimensions are 345 by 375 miles (570 by 620km).  It’s really a crater as are all seas whose impact asteroid reached down to the Moon’s magma and caused lava to well up to produce the flat floor.  When the sunlight is low as it is now wrinkle ridges will appear showing where successive lava flows have stopped and solidified.

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

Addendum

Moon proper orientation

The Moon’s approximate orientation and phase at May 10, 2016. Created using Stellarium.

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