How to calculate the visible fraction of the Earth [e.g. 1972 Blue Marble, Apollo 17]

Kind of, it means he marked the center of the Earth from that point of view, and said “the center of the view”. But there’s really no such thing as the center of the view from a particular point in space. It varies based on where you point the camera, and how you crop the image. He really meant the center of the view of the Earth. The point here is that moon is above the center of the earth from the point of view of the camera, meaning the camera is nearly perfectly between the Earth and the Moon (assuming the time of the photo is correct).

So more illustratively. If someone in South Africa were to look 90° straight up a 10:40AM UTC ... Read even more

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