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The Mars 7 Flyby bus releases the descent module too early, missing Mars.

Related Wikipedia articles
Mars 7
Failed Soviet flyby/lander mission to Mars (1973–1974)
Mars 7, also known as 3MP No.51P was a Soviet spacecraft launched in 1973 to explore Mars. A 3MP bus spacecraft which comprised the final mission of the Mars programme, it consisted of a lander and a coast stage with instruments to study Mars as it flew past. Due to a…Source: Wikipedia (CC BY-SA)
March 9
Day of the year
March 9 is the 68th day of the year in the Gregorian calendar; 297 days remain until the end of the year.Source: Wikipedia (CC BY-SA)