I understand that it is the Earth’s shadow that causes moon phases. This works except for one problem, this morning the sun and the moon were out at the same time, which isn’t unusual except this time it dawned on me that if the whole Sun is out above the earth and the whole Moon is up above the Earth how is there still a shadow over the moon? Wouldn’t it have to be a full moon because the full sun is shining on it now? Or why wouldn’t the moon phases be horizontal instead of vertical?
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>I understand that it is the Earth’s shadow that causes moon phases.
That’s not true.
The phases are the moon’s shadow on itself. Consider you have a sphere, and you shine a flashlight on it. Then you can walk around and different shapes will be illuminated.
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