Apollo 8, where it took 134 days between “what if we go to the moon?” to the actual landing.
Should be “flight” instead of “landing”. Apollo 8 was the first manned flight to the moon. The first landing was Apollo 11 in July 1969. Also, they just changed the Apollo 8 mission profile from earth orbit to lunar orbit with the same spacecraft—so the hardware was already existing.
Piggybacking with another nitpick:
Should be “flight” instead of “landing”. Apollo 8 was the first manned flight to the moon. The first landing was Apollo 11 in July 1969. Also, they just changed the Apollo 8 mission profile from earth orbit to lunar orbit with the same spacecraft—so the hardware was already existing.