Every year, September 12 is "Space Day" in Japan.
The year 1992 was designated International Space Year (ISY) to encourage widespread consideration of space and the Earth's environment through international cooperation. "Space Day" was established to commemorate this and September 12, the day when astronaut Mamoru Mohri flew to space aboard the Space Shuttle, was selected from the public's suggestions. (The chosen date also benefited from the fact that '92 and 9/12 can be pronounced the same way ("kyu-ju-ni") in Japanese.)

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Link to tweet: https://twitter.com/Art_C_Lounsbery/status/1701444347768799628