In December 1968, the Apollo 8 mission carried three astronauts on a trip around the Moon-- further than anyone had ever gone before. For a mission that far, navigation was the biggest unknown factor. Had the spacecraft's velocity been even a bit off, it would've crashed onto the far side of the Moon.
In December 1968, the Apollo 8 mission carried three astronauts on a trip around the Moon-- further than anyone had ever gone before. For a mission that far, navigation was the biggest unknown factor. Had the spacecraft's velocity been even a bit off, it would've crashed onto the far side of the Moon.
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