10/01/1946 US Army establishes 1st radar contact with Moon
OTD in Space – January 10: Radar Astronomy is Born!
U.S. Army Makes Radar Contact With the Moon 1946
#225: Introduction to the Project Diana 70th Anniversary Special Event
Project Diana was an experimental project of the US Army Signal Corps to bounce radar signals off the Moon and receive the reflected signals. This was the first experiment in radar astronomy and the first active attempt to probe another celestial body. It was the inspiration for later Earth-Moon-Earth communication techniques.