Why doesn't a lunar eclipse occur every full moon?

Related questions

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2. Is there a time change in Texas?
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6. Will my phone time change automatically?
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Tags

1. #because
2. #shadow
3. #plane
4. #happen
5. #every
6. #occurs
7. #falls
8. #lunar
9. #around
10. #month
11. #orbit
12. #eclipse
13. #solar
14. #earth
15. #enters