Also called Earth-Moon-Earth (EME), the technique of using the moon as a passive radio signal reflector. High-powered signals are transmitted from antennas pointed at the moon, which acts as a giant mirror in the sky, bouncing the radio waves back to listeners on Earth.

First done in 1946 by John H. DeWitt Jr. as he was working on the Pentagon's Project Diana. Ham radio signals were first bounced off the moon in 1953. Today, this is commonplace.

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