dcterms modified equal to or less than 2020-11-02T16:09:25.582Zequal to or more than 2020-11-02T16:09:25.582Z
broader original
264 original
definition A flat mirror with a clock-drive mounted in such a way that it moves from east to west to compensate for the apparent rotation of the Earth in order that the image of a particular area of sky remains fixed in the focal plane.
Resource original
Concept original
contributor AAS_Frey.Katie_Admin original