The disappearance or setting of Earth below the lunar horizon as seen from the Moon, the opposite of earthrise.
Compound of 'earth' (Old English eorthe) and 'set' (Old English settan, from Proto-Germanic *satjan). A space-age term created to mirror 'sunset,' describing Earth's position relative to the lunar observer.
Earthset is the rarest of perspective words—only astronauts have ever witnessed it, and the term reminds us that 'rising' and 'setting' are completely dependent on where you're standing in the universe.
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