In 1962, Armstrong was transferred to astronaut status. He served as command pilot for the Gemini 8 mission, launched March 16, 1966, and along with David Scott, performed the first successful docking of two vehicles in space by mating his Gemini 8 with an uninhabited Agena rocket.
The Gemini 8 mission was launched in the first month of 1966.
March is not the first month in 1966, or any year. It's difficult because the system might not understand how the months are ordered.
( z1 launch :ARG1 ( z2 mission :ARG1 ( z3 program :name ( z4 name :op "Gemini" :op 8 ) ) ) :time ( z5 date-entity :year 1966 :month 1 :ord ( z6 ordinal-entity :value 1 ) ) )