# coordinate system

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The Four Main Coordinate Systems
coordinate system

## coordinate system

() A system, resembling that of latitude and longitude on the Earth, by which the direction of a celestial body or a point in the sky can be specified. The direction is defined and determined by two spherical coordinates, referred to a fundamental great circle lying on the celestial sphere and a point on the fundamental circle (see illustration). One coordinate (a) is the angular distance of the celestial body measured perpendicular to the fundamental circle along an auxiliary great circle passing through the body and the poles of the fundamental circle. The other coordinate (b) is the angular distance measured along the fundamental circle from a selected zero point to the intersection of the auxiliary circle.

There are four main coordinate systems: the equatorial, horizontal, ecliptic, and galactic coordinate systems (see table). They are all centered on the Earth. Transformations can be made from one system to another by means of the relationships between the angles and sides of the relevant spherical triangles. The astronomical triangle, for example, relates equatorial and horizontal coordinates; the triangle formed by the celestial body and the poles of the equator and ecliptic relates equatorial and ecliptic coordinates. See also heliocentric coordinate system.

Collins Dictionary of Astronomy © Market House Books Ltd, 2006
References in periodicals archive ?
for non-elastic curve a, which is parametrized by the arc-lengths.
Each member function of the input variables (E and dE) of the wind fuzzy logic controller with MATLAB fuzzy tools is parametrized for E and dE, as illustrated in Figures 13 and 14, respectively.
Couvreux, 2013: Resolved versus parametrized boundary-layer plumes.
Using (42) and Duan's convergence parameter technique, we obtain the following parametrized recursion scheme:
The discrete and the continuous part of the computational model are parametrized accordingly to meet the experimental setup as shown in Table 2.
In this work the features of the map are parametrized directly in Euclidean coordinates.
Equations (17a) and (17b) describe in-type clothoids parametrized by the constants [alpha], [gamma] and the running variable s [member of] [0, [s.sub.CC]], starting from [q.sub.in] (0) = 0 and arriving at some [q.sub.in] ([s.sub.CC]), where [s.sub.CC] denotes the whole curve length.
In the following, we will suppose that the origin of the coordinate system, p, is the barycenter of an admissible source set [omega] [subset] [OMEGA], in which we suppose symmetric star-shaped set, whose boundary, [partial derivative][omega], is parametrized by a function R.
A random field Z is a set of random variables (precipitation in our case) parametrized by some set D [subset] [R.sup.n]
The arrangement is parametrized by h, [d.sub.1], and [d.sub.2] in (1).
The modules constructed in this subsection correspond to those parametrized by [lambda] = [1, 0] [member of] [P.sup.1]k.
[47] extended the concept of neutrosophic set to single valued neutrosophic sets (SVNSs) and they also studied the set theoretic operators and various properties of SVNSs, many other sets were introduced such as neutrosophic soft set [48], weighted neutrosophic soft sets [49], generalized neutrosophic soft set [50], Neutrosophic parametrized soft set [51], Neutrosophic soft expert sets [52, 53], Neutrosophic soft multi-set [54], neutrosophic bipolar set [55], neutrosophic cubic set [56, 57], rough neutrosophic set [58, 59], interval rough neutrosophic set [60], Interval-valued neutrosophic soft rough sets [61, 62], etc.

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