computistic
/ˌkɒmpjʊˈtɪstɪk/Chiefly historical
adjective
Of or relating to computation; especially of or relating to calendrical or astronomical calculation, or the use of a computus.
Origin
Mid 19th century; earliest use found in John Herschel (1792–1871), mathematician and astronomer. Probably from post-classical Latin computisticus.