Modeling the Earth, sun, and moon system
The moon doesn't make its own light, it reflects sunlight, and how much of its sunlit half we can see from Earth changes as it orbits us, producing the pattern of phases from new moon to full moon and back. A solar eclipse happens when the moon passes directly between Earth and the sun, blocking our view of the sun, and a lunar eclipse happens when Earth passes directly between the sun and the moon. Seasons happen because Earth's axis is tilted, not because Earth moves closer to or farther from the sun.
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Test your knowledge
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Midterm
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This final covers a lot of topics, so it's split into 2 parts. Each part includes a question from every one of its topics.
Final, Part 1 of 2
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Final, Part 2 of 2
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