sideralis

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.

sīdĕrālis, e, adj. [sidus],

of or belonging to the stars , sidereal (Plinian): scientia, Plin. 7, 49, 50, § 160; cf. difficultas, astronomy , id. 18, 24, 56, § 206.