Is Ophiuchus a real zodiac sign?

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Tags

1. #union
2. #zodiac
3. #thirteenth
4. #astronomical
5. #sidereal
6. #boundaries
7. #serpent
8. #ophiuchus
9. #international
10. #greek
11. #signs
12. #constellation
13. #bearer
14. #twelve
15. #defined
16. #sometimes
17. #astrology
18. #eponymous
19. #addition
20. #because
21. #tropical