May 29 1971
From The Space Library
Countdown for launch of NASA's Mariner-I spacecraft toward Mars orbit was interrupted by hold at 4:59 pm EDT 72 min from launch. Hold was caused by difficulty in interpreting data from Centaur stage guidance package. Difficulty was not resolved by 6 pm and launch was postponed to next day. (NASA Proj Off)
U.S.S.R. launched Cosmos 425 from Plesetsk into orbit with 550-km (341.8-mi) apogee, 508-km (315.7-mi) perigee, 95.1 min period, and 74° inclination. (GSFC SSR, 5/31/71; SBD, 6/2/71, 169)
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