Astronomical coordinate systems | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-02-18

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Celestial_coordinate_system


00:01:02 1 Coordinate systems
00:01:51 1.1 Horizontal system
00:02:32 1.2 Equatorial system
00:03:54 1.3 Ecliptic system
00:04:50 1.4 Galactic system
00:05:23 1.5 Supergalactic system
00:05:43 2 Converting coordinates
00:06:00 2.1 Notation
00:07:01 2.2 Hour angle ↔ right ascension
00:07:38 2.3 Equatorial ↔ ecliptic
00:15:44 2.4 Equatorial ↔ horizontal
00:30:25 2.5 Equatorial ↔ galactic
00:35:55 2.6 Notes on conversion
00:36:40 3 See also
00:38:08 4 Notes and references
00:39:07 5 External links
00:39:29 Notes and references
00:40:51 External links



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SUMMARY
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In astronomy, a celestial coordinate system (or celestial reference system) is a system for specifying positions of celestial objects: satellites, planets, stars, galaxies, and so on. Coordinate systems can specify an object's position in three-dimensional space or plot merely its direction on a celestial sphere, if the object's distance is unknown or trivial.
The coordinate systems are implemented in either spherical or rectangular coordinates. Spherical coordinates, projected on the celestial sphere, are analogous to the geographic coordinate system used on the surface of Earth. These differ in their choice of fundamental plane, which divides the celestial sphere into two equal hemispheres along a great circle. Rectangular coordinates, in appropriate units, are simply the cartesian equivalent of the spherical coordinates, with the same fundamental (x, y) plane and primary (x-axis) direction. Each coordinate system is named after its choice of fundamental plane.