National Astronomical Observatory of Japan

The National Astronomical Observatory of Japan is a central institution for astronomical research in Japan, focusing on the study of astronomy and the development of astronomical observation equipment. Part of its campus includes public tour routes, and regular events are also held for the general public.

The facility opens parts of its grounds to the public, where visitors can freely explore historic buildings constructed from the Taisho to early Showa periods. On Saturdays and Sundays, the "Sun Observation Event" is held at the 20-cm Telescope Dome, where, weather permitting, visitors can observe sunspots using a 20 cm diameter telescope operated by staff. The schedule for observation sessions can be checked on the official website (no reservation required, free of charge).

Additionally, the 4D2U dome theater hosts regular public screenings three times a month (suitable for elementary school students and older, limited capacity, reservations required). Here, visitors can view three-dimensional simulations created using the "Mitaka" astronomical simulation software developed at the observatory, along with other visuals produced using supercomputers.

The "Regular Observation Meetings" are held twice a month, allowing visitors to observe seasonal celestial bodies through a 50 cm telescope. These sessions provide views of the moon's craters, Jupiter's stripes, Galilean moons, Saturn's rings, and more (limited capacity, reservations required.).