coordinate system is named after its choice of fundamental plane. The following table lists the common coordinate systems in use by the astronomical community...

degrees (°). The first galactic coordinate system was used by William Herschel in 1785. A number of different coordinate systems, each differing by a few degrees...

fixed points, perched on the horizon. Azimuth Astronomical coordinate systems Astronomical coordinate systems § Converting coordinates Geocentric coordinates...

The equatorial coordinate system is a celestial coordinate system widely used to specify the positions of celestial objects. It may be implemented in spherical...

In astronomy, the ecliptic coordinate system is a celestial coordinate system commonly used for representing the apparent positions, orbits, and pole orientations...

Earth-fixed coordinate system (acronym ECEF), also known as the geocentric coordinate system, is a cartesian spatial reference system that represents...

geographic, geodetic, and the geocentric coordinate systems for planets other than Earth. Similar coordinate systems are defined for other solid celestial...

Besides the equatorial and ecliptic systems, some other celestial coordinate systems, like the galactic coordinate system, are more appropriate for particular...

In solar observation and imaging, coordinate systems are used to identify and communicate locations on and around the Sun. The Sun is made of plasma, so...

The supergalactic coordinate system is a reference frame for the supercluster of galaxies that contains the Milky Way galaxy, referenced to a local relatively...

points to help position a planet within this ecliptic coordinate system. In Babylonian astronomical diaries, a planet position was generally given with...

Planetary coordinate systems use formulations analogous to the geographic coordinate system. A series of astronomical coordinate systems are used to measure...

International Celestial Reference System (ICRS) is the current standard celestial reference system adopted by the International Astronomical Union (IAU). Its origin...

is an important reference plane and is the basis of the ecliptic coordinate system. The ecliptic is the apparent path of the Sun throughout the course...

sphere. For a geographic coordinate system of the Earth, the fundamental plane is the Equator. Astronomical coordinate systems have varying fundamental...

Way Galaxy. In actual astronomical practice, the delineation of the galactic quadrants is based upon the galactic coordinate system, which places the Sun...

celestial reference system (BCRS) is a coordinate system used in astrometry to specify the location and motions of astronomical objects. It was created...

southern), used as a reference point in celestial coordinate systems. In diagrams using such coordinate systems, it is often indicated with the symbol ♈︎. Named...

poles of astronomical bodies are determined based on their axis of rotation in relation to the celestial poles of the celestial sphere. Astronomical bodies...

Earth-centered inertial (ECI) coordinate frames have their origins at the center of mass of Earth and are fixed with respect to the stars. "I" in "ECI"...

in the South Atlantic Ocean and published by him in 1678. Astronomical coordinate systems Celestial spheres Northern celestial hemisphere David Ellyard...

vector u ^ {\displaystyle {\hat {\boldsymbol {u}}}} of the rotating coordinate system (such as ı ^ ,   ȷ ^ , {\displaystyle {\hat {\boldsymbol {\imath }}}...

coordinate system, it is necessary to specify the date for which the equinox is chosen. This date should not be confused with the epoch. Astronomical...

declination, these astronomical coordinates specify the location of a point on the celestial sphere in the equatorial coordinate system. An old term, right...

astronomical data of the considered type. When the data are dependent for their values on a particular coordinate system, the date of that coordinate...

M. Nautical Almanac Office (2008). "Time Scales and Coordinate Systems, 2010". The Astronomical Almanac for the Year 2010. U.S. Govt. Printing Office...

principles from physics and chemistry to describe and explain astronomical objects and astronomical phenomena. Theorists in astronomy endeavor to create theoretical...

year zero in both the astronomical year numbering system (where it coincides with the Julian year 1 BC), and the ISO 8601:2004 system, the interchange standard...

coordinates in general relativity. The coordinate systems involve a world-time, i.e. a global time coordinate that could be set up by telemetry. Individual...

at the opposite ends. In another approach known as the horizontal coordinate system, the meridian is divided into the local meridian, the semicircle that...