Paul Yachita Tsuchihashi (?? ???, Tsuchihashi Yachita, 1866-1965), S.J.
was a Japanese Roman Catholic priest, mathematician, astronomer, Sinologist, lexicographer, academic and administrator.
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.