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Answer for the clue "Optical device used to follow the path of a celestial body and reflect its light into a telescope ", 9 letters:
coelostat

Alternative clues for the word coelostat

Word definitions for coelostat in dictionaries

Wiktionary Word definitions in Wiktionary
n. (context astronomy English) A device that rotates a telescope so as to keep its orientation constant with relation to the (l en stars).

WordNet Word definitions in WordNet
n. 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

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
coelostat \coe"lo*stat\ n. an optical instrument used to follow the path of a celestial body and reflect its light into a telescope; it has a movable and a fixed mirror. [WordNet 1.5] ||

Usage examples of coelostat.

We even have coelostats, little devices that will spin the opposite way to the ship, if we need them.