On This Day.
>comfy reply tweets
U.S. Space Command @US_SpaceCom
#OTD in 1946: The @USArmy #SignalCorps successfully bounced 1st radar waves off the Moon w a modified SCR-271 long-range radar #antenna in an effort named #ProjectDiana. The echo waves took about 2.5 sec to return to Earth. @ArmyCIOG6
11:05 AM · Jan 10, 2021
>https://twitter.com/US_SpaceCom/status/1348299813046136840