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Answer for the clue "Has a movable and a fixed mirror ", 9 letters:
coelostat

Alternative clues for the word coelostat

Word definitions for coelostat in dictionaries

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] ||

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).

Usage examples of coelostat.

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