For the first time forty years ago yesterday, humans saw their first Earthrise. BBC has the story:
... on Christmas Eve 1968, none of the astronauts on board Apollo 8 were ready for the opportunity to witness their own Earthrise.
In all the months of training and preparation which had preceded the mission, no-one had thought to schedule an attempt for the crew to glimpse and record the most moving of sights, as their jewel of a home planet, suspended in the blackness of space, rose from behind the barren lunar horizon.
... as Apollo 8 nosed its way back from the far side of the Moon for the fourth time, it was Frank Borman who first spotted the view by chance from a window, his reaction captured by the on board tape recorder.
"Oh, my God! Look at that picture over there!" he exclaimed. "Isn't that something…"