Home > Ephemeris Program, Observing, The Moon > 02/17/2014 – Ephemeris – Viewing tonight’s waning gibbous moon

02/17/2014 – Ephemeris – Viewing tonight’s waning gibbous moon

February 17, 2014

Ephemeris for President’s Day, Monday, February 17th.  The sun will rise at 7:39.  It’ll be up for 10 hours and 34 minutes, setting at 6:13.   The Moon, 3 days past full, will rise at 9:17 this evening.

The bright Moon is now a waning gibbous phase,  The right edge of the Moon is now in night as the sunset terminator slowly advances across the moon.  Tonight the Sea of Fertility is half in daylight on the right side of the Moon.  A telescope looking at it can spot the double crater of Messier and Messier A, a funny impact where the small asteroid skipped producing two craters and a double ray of ejecta.  On the other side of the moon the largest sea Oceanus Procellarum, or Ocean of Storms can be seen in its entirety to the left limb of the moon.  It happens that the moon is rotated toward us on that side, an effect called libration.  The effect is due to the moon’s uneven velocity around the earth.

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

Addendum

Moon

The moon at 9 p.m. on February 17, 2014 showing Oceanus Procellarum and the craters Messier A and B. Created using Virtual Moon Atlas.

Messier A&B #1

Closeup of the craters Messier A and B showing their twin rays. Created using Virtual Moon Atlas and the Lunar Reconnaissance Orbiter images. Credit: NASA.

Messier A&B #2

Extreme closeup of the craters Messier A and B showing their twin rays. Created using Virtual Moon Atlas and the Lunar Reconnaissance Orbiter images. Credit: NASA.

 

 

  1. richard Kuschell's avatar
    richard Kuschell
    February 17, 2014 at 10:15 am

    Finaliy some clear skies in T C. The Moon was spectacular last night.

  2. February 17, 2014 at 10:22 am

    Yes. This is the time of year that the skies start clearing up because Lake Michigan has cooled down. And as a special bonus this year Lake Michigan is pretty much frozen over, turning the lake effect snow machine off. Yay!

    • February 18, 2014 at 9:55 pm

      Of course it snowed 4 inches last night.

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