Heliometer

Origin

helio-, from Ancient Greek Ἥλιος, from ἥλιος (hēlios, "sun") + meter, from French mètre, from Ancient Greek μέτρον (metron, "measure").

Full definition of heliometer

Noun

1. An astronomical instrument, based on a telescope, for measuring the diameter of the sun; now used to measure the angular distance between stars and other celestial bodies.

Related terms

• heliometric
• heliometry