Wednesday May 15, 2024

First Quarter Moon

When the moon completes the first quarter of its orbit around Earth at 7:48 a.m. EDT, 4:48 a.m. PDT, or 11:48 UT on Wednesday, May 15, the 90 degree
angle formed by the Earth, sun, and moon will cause us to see our natural satellite half-illuminated - on its eastern side. While at first quarter,
the moon always rises around noon and sets around midnight, allowing us to
see it in the afternoon daytime sky, too. The evenings surrounding the first quarter phase are the best ones for viewing the lunar terrain when it is dramatically lit by low-angled sunlight.

(Data courtesy of Starry Night)
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