1970 Event Zond 8 Launch (Moon Orbit and Return) 1968 Event Launch of Zond 6, 2nd unmanned circumlunar and return flight 1968 Event Zond 5 completes flight 1968 Event Zond 5 completes circumnavigation of Moon 1968 Event Launch of Zond 5, 1st lunar fly-around with Earth reentry 1968 Event U.S.S.R.'s Zond 5 is launched on 1st circumlunar flight 1968 Event U.S.S.R. launches space probe Zond 4; fails to leave Earth orbit 1965 Event Zond 3 launched to fly by Moon, enters solar orbit 1964 Event U.S.S.R. launches Zond 2 towards Mars; no data returned 1964 Event U.S.S.R. launches Zond 1 to Venus; no data returned
