Topocentric Coordinates
This entry contributed by Dana Romero
Astronomical coordinates which use the observer's location as the center of the coordinate system, for example, .
Topocentric
With reference to, or pertaining to, a point on the surface of the Earth, usually with reference to a coordinate system.
Topological Defects
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Topocentric Referred to a position on the surface of the Earth (cf geocentric, which is referred to the centre of the Earth.) ...
Topocentric. Meaning: As seen from the surface of the Earth. Most celestial co-ordinates used are topocentric.
(see also topocentric)
NOTE: The list of defined terms to the left is by no means exhaustive with respect to the general subject of solar system dynamics.
topocentric (Solar System Dynamics Glossary - JPL) Refers to a reference system centered at some location on the Earth (for example, the geographic location of an observatory).
The celestial sphere can be used geocentrically and topocentrically. The former means that it is centred around an imaginary observer in the centre of the Earth, and no parallax effects need to be taken into account.
The position on a celestial sphere, centered at the Earth, determined by removing from the directly observed position of a celestial body the effects that depend on the topocentric location of the observer; i.e., refraction, diurnal aberration.
topocentric Of measurements or coordinates, referred to the position of the observer on the earth as the origin. topple Of a gyro, the vertical component of precession or wander, or the algebraic sum of the two.
 See also: Horizon, Parallax, Earth, Time, Meridian
  
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