Etymology

Airy-0

Today it means: A crater on Mars, located within the larger Airy Crater, used as the determining landmark for the Martian prime meridian. Full definition →

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The story

From Airy Crater, the larger crater this smaller crater is located within, and 0° of the prime meridian. Named after George Biddell Airy, a British astronomer who helped establish the Greenwich Meridian as the Prime Meridian on Earth.

Etymology from Wiktionary, CC BY-SA 4.0.