Career
Father Paul is known for having developed extensive tables for converting traditional Japanese era dates into Gregorian calendar equivalents — compare, e.g., Calendrical Time Conversion Table which is derived from a formula for determining the numbered date in the Japanese month. After completing studies in Paris, Tsuchihashi was assigned to Shanghai and the observatory at She Shan Hill (Zose). In this period, his work focused on the movement of asteroids.
He taught mathematics and Chinese literature.
He was Rector of the university from 1940 until the end of the war years.