How do moon phases work?

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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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Thank you all so much. This is the first time I’ve came to Reddit for a random question and I wasn’t disappointed. I knew it had to be something simple, yet one morning after getting nowhere near enough sleep the question popped into my head and I almost had a midlife crisis because I couldn’t come up with an answer LOL.

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