Conversation so far:
what does the red dot on the japanese flag mean
The red disc on the flag of Japan represents the sun.
when did the flag of japan with the red disc representing the sun become the national flag of japan
The national flag of Japan, a rectangular white banner bearing a crimson-red disc at its center, was adopted as the national flag on August 13, 1999.
Why were red and white chosen for the flag of Japan?
One theory for the Japanese flag design is a sense of Sacred–profane dichotomy where sacred equals red, while profane equals white.
How is the flag of Japan perceived?
The display of the national flag at homes and businesses is debated in Japanese society.

Question: what is the importance of the sun on the flag
Self-contained rewrite: What is the importance of the sun on the Flag of Japan?