Siderostat

Pronunciation: /ˈsɪdˈɪɹoʊˈstæt/

Siderostat (noun)

  1. A device with a mirror that turns to keep a distant star or object in the same direction for observation.

Examples

  • A siderostat is a star-tracking mirror that follows the sky’s movement.
  • The telescope uses a siderostat to keep a star in view.