Relating to both Earth and the Moon, or the gravitational relationship between them.
From 'geo-' (earth) plus 'selenic' (from Selene, the Greek goddess of the Moon), combining to describe phenomena involving both bodies.
The geoselenic relationship is why we have tides—the Moon's gravity pulls on Earth's oceans, and few people realize that without this cosmic dance, our planet would be a very different place.
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