
In July 1962, a missing overbar in Mariner 1’s guidance equation helped send the Venus probe off course 293 seconds after launch, forcing range safety to destroy NASA’s $18.5 million mission
On July 22, 1962, a missing overbar in guidance code combined with a radar failure to send Mariner 1 off course. The range safety officer destroyed the Venus-bound probe 293 seconds after launch, at a cost of $18.5 million.














