1. Shosanbetsu Astronomical ObservatoryShosanbetsu Mura Shosanbetsu is a village located in Rumoi Subprefecture, Hokkaido, Japan. As of September 2016, the village has an estimated population of 1,249 and a density of 4.5 persons per km². The total area is 280.04 km². Shosanbetsu observatory is a planetarium-cum-astronomical observatory which is a popular attraction in this region. From Wikipedia, the free encyclopedia.