Takakazu SEKI joined a group producing a territorial map of the Koshu Domain, and he also studied Juji-reki Calendar in preparation for the changing of a calendar (which did not come to fruition in the end).
関孝和は甲州藩の国絵図の作成に参加し、（実現はしなかったものの）改暦の準備のために授時暦の研究をしている。