sciatherical
/sʌɪəˈθɛrɪkl/Now literary and historical
adjective
Intended for or concerned with the measurement or recording of shadows cast by the sun, especially as a means of finding the time of day (as with a sundial). Also as noun: a sundial ( rare ).
Origin
Early 17th century; earliest use found in Thomas Tomkis (b. c1580), playwright. From post-classical Latin sciathericus, sciotericus, sciothericus sciatheric + -al.