What does seeing mean to an astronomer?

Related questions

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6. Why do astronomers use telescopes?
7. Can telescope see through clouds?
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Tags

1. #astronomy
2. #turbulent
3. #seeing
4. #atmosphere
5. #earth
6. #astronomical
7. #problems
8. #variations
9. #refractive
10. #stars
11. #objects
12. #biggest
13. #based
14. #index
15. #blurring
16. #apparent
17. #twinkling
18. #mixing
19. #causing
20. #optical
21. #refers
22. #amount