Glossary term: Celestial Coordinates
Description: From Earth, we see the sky as a celestial sphere. We can describe any position on that sphere using two numbers. Every method for assigning two such numbers to a sky position is called a celestial coordinate system, and the numbers are called the object's (celestial) coordinates. On Earth's surface, we use geographical latitude and longitude for the same purpose, and in fact one way of defining celestial coordinates is derived from that: those points in the sky that are directly above Earth's equator form the celestial equator, and the point directly above a certain location on Earth's globe is assigned numbers directly related to the latitude/longitude of the base point. Astronomers use different kinds of coordinate systems, including a number that takes into account Earth's daily rotation, so the coordinates of, say, a star do not change significantly over timescales of days, months or years.Related Terms:
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Term and definition status: This term and its definition is still awaiting approval
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