Why is January 1 1970 the epoch?

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1. #until
2. #there
3. #epoch
4. #86400
5. #issue
6. #number
7. #definition
8. #problem
9. #since
10. #discussed
11. #increases
12. #january
13. #exist
14. #encoding
15. #current
16. #exactly
17. #below