Equatorial coordinate system | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-10-03

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Equatorial_coordinate_system


00:00:59 1 Primary direction
00:03:12 2 Spherical coordinates
00:03:22 2.1 Use in astronomy
00:04:23 2.2 Declination
00:05:05 2.3 Right ascension
00:05:56 2.4 Hour angle
00:06:12 3 Rectangular coordinates
00:07:23 3.1 Geocentric equatorial coordinates
00:07:34 3.2 Heliocentric equatorial coordinates
00:10:51 4 See also
00:12:06 5 References



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SUMMARY
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The equatorial coordinate system is a celestial coordinate system widely used to specify the positions of celestial objects. It may be implemented in spherical or rectangular coordinates, both defined by an origin at the centre of Earth, a fundamental plane consisting of the projection of Earth's equator onto the celestial sphere (forming the celestial equator), a primary direction towards the vernal equinox, and a right-handed convention.The origin at the center of Earth means the coordinates are geocentric, that is, as seen from the centre of Earth as if it were transparent. The fundamental plane and the primary direction mean that the coordinate system, while aligned with Earth's equator and pole, does not rotate with the Earth, but remains relatively fixed against the background stars. A right-handed convention means that coordinates increase northward from and eastward around the fundamental plane.