You are watching Tenchi: The Samurai Astronomer the movie produced in Japan belongs with duration 141 Min in Category Drama,History,. broadcast at streamingjoy.com , by [ KADOKAWA ] A chronicle of the life of Yasui Santetsu, a 17th century master of go who turned his attention to astronomy and created a new calendar for Japan. Based on the life of Santetsu Yasui (December 27, 1639-November 1, 1715), appointed as the first official astronomer in the Edo Period and would go on to create the Jokyo calendar at the imperial request..