Apollo 8 enters into orbit around the Moon

Today this happened in the past

December 24, 1968, Apollo 8 enters into orbit around the Moon the first for humans.

According to Wikipedia:  

"Taken by Apollo 8 crewmember Bill Anders on December 24, 1968, at mission time 075:49:07 (16:40 UTC), while in orbit around the Moon, showing the Earth rising for the third time above the lunar horizon."

It is also the first time "Earthrise" entered into our vocabulary.  

Additionally from Wikipedia:

 "Apollo 8, the second human spaceflight mission in the United States Apollo space program, was launched on December 21, 1968, and became the first manned spacecraft to leave Earth orbit, reach the Earth's Moon, orbit it and return safely to Earth. The three-astronaut crew—Commander Frank Borman, Command Module Pilot James Lovell, and Lunar Module Pilot William Anders—became the first humans to travel beyond low Earth orbit, the first to see Earth as a whole planet, the first to directly see the far side of the Moon, and then the first to witness Earthrise. The 1968 mission, the third flight of the Saturn V rocket and that rocket's first manned launch, was also the first human spaceflight launch from the Kennedy Space Center, Florida, located adjacent to Cape Canaveral Air Force Station."

Apollo 8 crew is photographed posing on a Kennedy Space Center (KSC) simulator in their space suits. From left to right are James A. Lovell Jr., William A. Anders, and Frank Borman.

Watching humans circle the Moon for the first time during Apollo 8, Christmas Eve 1968.