May 21 - June 21: These dates mark the zodiac period for Gemini, the third astrological sign in the zodiac.
March 23, 1965: Gemini 4, a NASA mission, was launched. It was the first U.S. spaceflight to carry two astronauts and set several spaceflight endurance records.
June 3, 1966: Gemini 9A was launched, carrying astronauts Thomas P. Stafford and Eugene A. Cernan. During this mission, Cernan performed the first spacewalk by an American astronaut.
July 18, 1966: Gemini 10 was launched, carrying astronauts John W. Young and Michael Collins. During this mission, Young and Collins performed a spacewalk and used a propulsion unit to maneuver in space.
December 4, 1965: Gemini 7, a 14-day mission, set a new record for the longest crewed spaceflight at that time. It aimed to study the effects of long-term space travel on human physiology.
October 25, 1968: Gemini 12 was launched, marking the conclusion of the Gemini program. It was the final successful mission of the project, which played a crucial role in paving the way for the Apollo missions and human exploration of the Moon.