Fundamental plane (spherical coordinates)
The fundamental plane in a
geocentric latitude of a point is then the angle between the fundamental plane and the line joining the point to the centre of the sphere.[1]
For a geographic coordinate system of the Earth, the fundamental plane is the Equator.
Astronomical coordinate systems have varying fundamental planes:[2]
- The horizontal coordinate system uses the observer's horizon.
- The Besselian coordinate system uses Earth's terminator (day/night boundary).[3] This is a Cartesian coordinate system (x, y, z).
- The equatorial coordinate system uses the celestial equator.
- The ecliptic coordinate system uses the ecliptic.
- The galactic coordinate system uses the Milky Way's galactic equator.
See also
- Plane of reference
References
- ISBN 9780387753782.
- ^ Newcomb, Simon (1906). A Compendium of Spherical Astronomy with Its Applications to the Determination and Reduction of Positions of the Fixed Stars. Macmillan. p. 92..
- ^ "NASA - Besselian Elements of Solar Eclipses". NASA. Retrieved 13 August 2022.
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