Definition of coelostat in English:

Share this entry


Pronunciation: /ˈsēləˌstat/


An advanced version of a heliostat, having a rotating mirror that continuously reflects the light from the same area of sky, allowing the path of a celestial object to be monitored.
Example sentences
  • This error can be reduced substantially by choosing the coelostat position and time interval.
  • Back in Ottawa, a specially designed shed with a roll off section housed the coelostat for almost 70 years.
  • To create rotating images in the full 360-degree range, two sets of coelostats can be combined, each compensating for the dead zone of the other.


Late 19th century: formed irregularly from Latin caelum 'sky' + -stat.

For editors and proofreaders

Syllabification: coe·lo·stat

Share this entry

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.