[see-luh-stat] /ˈsi ləˌstæt/

noun, Astronomy.
an apparatus consisting of a mirror driven by clockwork, used to enable a fixed telescope to keep the same area of sky in its field of view by compensating for the apparent rotation of the celestial sphere.
an astronomical instrument consisting of a plane mirror mounted parallel to the earth’s axis and rotated about this axis once every two days so that light from a celestial body, esp the sun, is reflected onto a second mirror, which reflects the beam into a telescope Compare siderostat


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