Sunday October 6, 2024

Earthshine (after sunset)

On the evenings surrounding Sunday, October 6, the young crescent moon will shine low in a twilit southwestern sky after sunset. Watch for Earthshine,
also known as the Ashen Glow and "the old moon in the new moon's arms". That's sunlight reflected off Earth and back onto the moon, slightly brightening the dark portion of the moon's Earth-facing hemisphere. The phenomenon appears for several days before and after each new moon. Since the Earthshine light has made an extra round trip from Earth to the moon and back, it is about 2.6 seconds "older" that then the light we see from the lit crescent.


(Data courtesy of Starry Night)
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