Monday, August 12, 2024

First Quarter Moon

The moon will complete the first quarter of its journey around Earth on
Monday, August 12 at 11:19 a.m. EDT, 8:19 a.m. PDT, or 15:19 UT. At that time, its 90-degree angle away from the sun will cause us to see the moon half- illuminated - on its eastern side. At first quarter, the moon always rises around mid-day and sets around midnight, so it is also visible in the
afternoon daytime sky. The evenings surrounding first quarter are the best
ones for seeing the lunar terrain when it is dramatically lit by low-angled sunlight, especially along the terminator, the pole-to-pole boundary that separates the lit and dark hemispheres.

(Data courtesy of Starry Night)
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