COELOSTAT

coelostat

(noun) optical device used to follow the path of a celestial body and reflect its light into a telescope; has a movable and a fixed mirror

Source: WordNet® 3.1

Etymology

Noun

coelostat (plural coelostats)

(astronomy) A device that rotates a telescope so as to keep its orientation constant with relation to the stars.

Source: Wiktionary

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