On the morning of December 24, 1968, the onboard cameras on NASA’s Apollo 8 spacecraft were focused on the lunar surface. However, that morning unfolded with a tiny bit of the unexpected. On board the spacecraft were astronauts Frank Borman, James Lovell, and William Anders. They all later recalled that perhaps the most important thing they discovered on their mission was Earth:
The famous image from Apollo 8 now known simply as Earthrise.
In a newly released video by NASA, seen below, NASA scientists use a number of photo mosaics and elevation data from their Lunar Reconnaissance Orbiter (LRO) to reconstruct for the very first time, 45 years later, exactly what these Apollo 8 astronauts saw on that December morning. As you listen to the talk, narrated by Andrew Chaikin (author of A Man on the Moon: The Voyages of the Apollo Astronauts), you’ll understand how this famous image (now known simply, elegantly as Earthrise) almost did not come to exist. Earthrise was captured on colour film with a modified Hasselblad 500 EL at 1/250 seconds at f/11, as you’ll hear in the film. The video, which can be viewed in 1080p HD, is well worth the seven minutes of your time:
Per the caption of the video:
The visualization draws on numerous historical sources, including the actual cloud pattern on Earth from the ESSA-7 satellite and dozens of photographs taken by Apollo 8, and it reveals new, historically significant information about the Earthrise photographs. It has not been widely known, for example, that the spacecraft was rolling when the photos were taken, and that it was this roll that brought the Earth into view. The visualization establishes the precise timing of the roll and, for the first time ever, identifies which window each photograph was taken from.
The key to the new work is a set of vertical stereo photographs taken by a camera mounted in the Command Module’s rendezvous window and pointing straight down onto the lunar surface. It automatically photographed the surface every 20 seconds. By registering each photograph to a model of the terrain based on LRO data, the orientation of the spacecraft can be precisely determined.
A still from NASA’s new visualization of how Earthrise came to be.
NASA’s visualization of Earthrise.