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...

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

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

and was published to The Astronomical Journal. International Celestial Reference System and its realizations – Current standard celestial reference system...

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...

Global Positioning System, and the several realizations of the International Terrestrial Reference System and Frame (such as ITRF2020 with subcentimeter...

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

datum or geodetic system (also: geodetic reference datum, geodetic reference system, or geodetic reference frame, or terrestrial reference frame) is a global...

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

mass. The 1980 Geodetic Reference System (GRS 80), adopted at the XVII General Assembly of the International Union of Geodesy and Geophysics (IUGG), posited...

The Global Positioning System (GPS) is a satellite-based hyperbolic navigation system owned by the United States Space Force and operated by Mission Delta...

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

(2020), "The third realization of the International Celestial Reference Frame by very long baseline interferometry", Astronomy and Astrophysics, 644:...

increasingly from the late 1950s as secondary realizations of ephemeris time (ET). These secondary realizations improved on the original ET standard by the...

precisely uniform than the primary standard itself. Such secondary realizations were used and described as 'ET', with an awareness that the time scales based...

interrelatedness of celestial mechanics and the Earth sciences and enabled a consistent transition from celestial mechanics to the Earth sciences and transformation...

living below the international and national poverty line. Measuring the proportion of the population covered by social protection systems and living in households...

Retrieved 3 August 2008. International Earth Rotation and Reference Systems Service (IERS) Working Group (2004). "General Definitions and Numerical Standards"...

orbital city or orbital colony) around the Earth or any other celestial body, as well as cyclers and interstellar arks, as generation ships or world ships. Space...

(2020). "The third realization of the International Celestial Reference Frame by very long baseline interferometry". Astronomy and Astrophysics. 644:...

1953, the organization became a permanent part of the United Nations System, and its name was changed to United Nations Children's Fund, though it retains...

large scale and nearly perfect vacuum. Typically, one measures the time needed for light to traverse some reference distance in the Solar System, such as...

rocky body in the Solar System. Its atmosphere is composed of mostly carbon dioxide (CO2), with a global sulfuric acid cloud cover and no liquid water. At...

theistic schools, "the words of the Lord", "the Divine Song",[page needed] and "Celestial Song" by others. The Sanskrit name is often written as Shrimad Bhagavad...

then to 60 minutes, and finally to 60 seconds each (24 × 60 × 60 = 86400). The current and formal definition in the International System of Units (SI) is...

Meteoroskopeion, i.e., a building showing celestial phenomena and the time. It had a pointer for the time and some automations similar to the Archimedes...

the Activities of States in the Exploration and Use of Outer Space, including the Moon and Other Celestial Bodies, commonly known as the Outer Space Treaty...

universe and the laws that govern celestial motion. Ptolemy goes beyond the mathematical models of the Almagest to present a physical realization of the...