How do they know when Easter is?

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Tags

1. #forward
2. #established
3. #sunday
4. #approximation
5. #march
6. #easter
7. #equinox
8. #first
9. #would
10. #council
11. #ecclesiastical
12. #depended
13. #point
14. #after
15. #nicaea
16. #vernal
17. #occurring