What does nadir mean?

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Tags

1. #sensors
2. #target
3. #elevation
4. #looking
5. #minimum
6. #practice
7. #which
8. #image
9. #resolution
10. #imagery
11. #shoot
12. #degrees
13. #doesn
14. #satellite
15. #straight
16. #angle
17. #typical
18. #happen
19. #collecting
20. #always
21. #degree
22. #nadir