Noun coelostat has 1 sense

1. coelostat - 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
   --₁ is a kind of optical device
   

Coelostat

Noun

A coelostat is a device used in astronomy to track the apparent movement of a celestial object by using mirrors or a combination of rotating mirrors and prisms.

Example sentence:

With the help of a coelostat, astronomers can observe the same star for extended periods of time without the need for constant adjustments.

Adjective

When referring to a place, coelostat describes something that is popular or well-known among locals.

Example sentence:

The small café hidden down the alley is a coelostat spot among locals, serving the best coffee in town.

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