
Skywatchers, take note: Tonight (May 23) and tomorrow night will offer excellent opportunities to observe the so-called "dark side" of the moon. The new moon occurred on Sunday evening (May 20), marked by an annular eclipse of the sun as the moon passed in front of it. The moon has now moved to the east of the sun, but is still mostly lit from behind. Only a slim crescent on the moon's east side is in full sunlight.
A word about east and west in the sky: When astronomers describe objects in the sky, they use "west" to mean "toward the western horizon" and "east" to mean "toward the eastern horizon." This puts east and west opposite to what we're used to on Earth maps. Just think of us as being on the inside of the sky map looking outward. However when astronomers talk about directions on the surface of a planet or moon, they use east and west exactly the way we do on Earth....
Image credit: Starry Night
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