On Christmas Eve, the astronauts read from the Book of Genesis in a live telecast from the orbiter: “In the beginning, God created the heaven and the earth. And the earth was without form, and void; and darkness was upon the face of the deep.”

Borman ended the broadcast with, “And from the crew of Apollo 8, we close with good night, good luck, a Merry Christmas, and God bless all of you — all of you on the good Earth.”

Lovell and Borman had previously flown together during the two-week Gemini 7 mission, which launched on Dec. 4, 1965 — and, at only 120 feet apart, completed the first space orbital rendezvous with Gemini 6.

“Gemini was a tough go,” Borman told The Associated Press in 1998. “It was smaller than the front seat of a Volkswagen bug. It made Apollo seem like a super-duper, plush touring bus.”

In his book, “Countdown: An Autobiography,” Borman said Apollo 8 was originally supposed to orbit Earth. The success of Apollo 7’s mission in October 1968 to show system reliability on long duration flights made NASA decide it was time to take a shot at flying to the moon.

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But Borman said there was another reason NASA changed the plan: the agency wanted to beat the Russians. Borman said he thought on orbit would suffice.

“My main concern in this whole flight was to get there ahead of the Russians and get home. That was a significant achievement in my eyes,” Borman said at a Chicago appearance in 2017.

It was on the crew’s fourth orbit that Anders snapped the iconic “Earthrise” photo showing a blue and white Earth rising above the gray lunar landscape.

Borman wrote about how the Earth looked from afar: “We were the first humans to see the world in its majestic totality, an intensely emotional experience for each of us. We said nothing to each other, but I was sure our thoughts were identical — of our families on that spinning globe. And maybe we shared another thought I had, This must be what God sees.”