Tokyo’s skyglow is intense, so Okutama, Bōsō, and Izu dark sites define real deep-sky nights. Winter Siberian highs deliver the sharpest transparency of the year.
Baiu rainy season often erases June–July observing windows.
Japan · Kantō · ~35.7°N
Check the live Tonight score, best clear window, and next ISS pass on this page, then open a tool with coordinates prefilled.
Learn: Is tonight good for stargazing? · How to see the Milky Way