Phil G
Grafted In
Well, standing here on the ground.. It certainly doesn't line up... visually.
If the moon is orbiting the earth at the rate of roughly once every 30 days, the side of it which faces the sun will take some time to change. This why the moon can look full over a period of about 3 nights but there are small changes every night.
The moon keeping the same side to the earth all the time means that, from the earth, the view the earth has of the sunlight hitting the moon won't significantly change through any given night.
The sense that the sun is moving below the earth is misleading because it is the earth rotating, not the sun moving. The relatively slow orbit of the moon and the relatively fast rotation of the earth means that the moon and sun's relative position to each other will not have significantly changed in the time the earth rotates in a number of hours or even a full rotation.
If the moon was orbiting the earth far quicker, like once every ten days, then the phase would be visibly changing through any given night.
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