Why is Japan's flag a red dot?

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Tags

1. #japan
2. #hinomaru
3. #called
4. #embodies
5. #known
6. #national
7. #center
8. #crimson
9. #officially
10. #sobriquet
11. #bearing
12. #circle
13. #commonly
14. #country
15. #nissh
16. #banner
17. #rising
18. #rectangular
19. #white