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

coordinate system Earth orientation parameters Geodetic datum International Celestial Reference System and its realizations Terrestrial reference frame World...

with the observer International Celestial Reference System and its realizations – Current standard celestial reference system and frame Orbital elements –...

global time and reference frame standards, notably through its Earth Orientation Parameter (EOP) and International Celestial Reference System (ICRS) groups...

needed] Month Lunar year Timekeeping on Mars International Celestial Reference System and its realizations Nautical time Sidereal time Ramirez-Simon, Diana...

astronomical objects International Celestial Reference System and Its Realizations, the current IAU approved reference frames in radio and optical wavelengths...

e.g. the Hindu and Buddhist calendars. Astrometry Ephemeris time Epoch International Celestial Reference System and its realizations Time in astronomy...

In physics and astronomy, a frame of reference (or reference frame) is an abstract coordinate system whose origin, orientation, and scale are specified...

mid- nineteenth century were instructive to the Celestial Empire's realization that it had lost its eminence as a prevailing world power. The defeats...

versions, the ideal International Terrestrial Reference System (ITRS) and its realization, the International Terrestrial Reference Frame (ITRF). A current...