heliometer

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Definition of heliometer

1 sense · 1 part of speech · etymology included

noun

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.

Definitions from Wiktionary, CC BY-SA.

From helio- + -meter, from Ancient Greek Ἥλιος (Hḗlios), from ἥλιος (hḗlios, “sun”), and French mètre, from Ancient Greek μέτρον (métron, “measure”).

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