Earthrise

a lot of webpages are using this photo to commemorate the first moon landing, but actually it was taken by Apollo 8...
Nalaka Gunawardene's blog has the full story...

As Apollo historian and film-maker Dr Christopher Riley recalled on the 40th anniversary of this remarkable event a few days ago:
For the first three orbits, preoccupied by the Moon and their latest TV broadcast, the spacecraft was not orientated to give them a chance to see the Earth. But as Apollo 8 nosed its way back from the far side of the Moon for the fourth time, one of the crew 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…”
After a quick joke about the fact that it was not in their flight plan to photograph it, the crew abandoned protocol and scrambled to get a snap of the occasion with their stills camera.
The Hasselblad only had a black and white film magazine in, resulting in the image (below) – the first photograph of Earthrise taken by a human as he watched it happen.
But this first historic picture is rarely reproduced. Not content with this first monochromatic image, the astronauts rushed to find a colour film, and Bill Anders managed to snap two more frames which became the choice of photo editors for the rest of history.