Saturday, November 9, 2024

First Quarter Moon

The moon will complete the first quarter of its 29.53-day trip around Earth on Saturday morning, November 9 at 12:55 a.m. EST or 05:55 UT, which converts to 9:55 p.m. PST on Friday evening. Lunar phases occur independently of Earth's rotation. First quarter moons always rise around mid-day and set around midnight, so they are also visible in the afternoon daytime sky. At first quarter, the moon's 90 degree angle from the sun causes us to see it half- illuminated on its eastern side. 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 moon's lit and dark hemispheres.

(Data courtesy of Starry Night)
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