December 15

1965 – Gemini 6A, crewed by Wally Schirra and Thomas Stafford, is launched from Cape Kennedy, Florida. Four orbits later, it achieved the first space rendezvous with Gemini 7.
1970 - The Soviet Venera 7 is the first probe to soft-land on Venus, transmitting for 23 minutes. The spacecraft send back a few images of the planet's surface before succumbing to the extreme heat and pressure of Venusian atmosphere.