25 relations: Astrometry, Astronomical object, Barycenter, Barycentric celestial reference system, Catalogues of Fundamental Stars, Circular motion, Earth, Earth orientation parameters, Epoch (astronomy), Extragalactic astronomy, Frame of reference, General relativity, Gravity, Inertial frame of reference, International Astronomical Union, International Celestial Reference System, International Earth Rotation and Reference Systems Service, International Terrestrial Reference System, Ionosphere, Mean squared error, Minute and second of arc, Noise floor, Quasar, Solar System, Very-long-baseline interferometry.

## Astrometry

Astrometry is the branch of astronomy that involves precise measurements of the positions and movements of stars and other celestial bodies.

New!!: International Celestial Reference Frame and Astrometry · See more »

## Astronomical object

An astronomical object or celestial object is a naturally occurring physical entity, association, or structure that exists in the observable universe.

New!!: International Celestial Reference Frame and Astronomical object · See more »

## Barycenter

The barycenter (or barycentre; from the Ancient Greek βαρύς heavy + κέντρον centre) is the center of mass of two or more bodies that are orbiting each other, which is the point around which they both orbit.

New!!: International Celestial Reference Frame and Barycenter · See more »

## Barycentric celestial reference system

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

New!!: International Celestial Reference Frame and Barycentric celestial reference system · See more »

## Catalogues of Fundamental Stars

The Catalogue of Fundamental Stars is a series of six astrometric catalogues of high precision positional data for a small selection of stars to define a celestial reference frame, which is a standard coordinate system for measuring positions of stars.

New!!: International Celestial Reference Frame and Catalogues of Fundamental Stars · See more »

## Circular motion

In physics, circular motion is a movement of an object along the circumference of a circle or rotation along a circular path.

New!!: International Celestial Reference Frame and Circular motion · See more »

## Earth

Earth is the third planet from the Sun and the only astronomical object known to harbor life.

New!!: International Celestial Reference Frame and Earth · See more »

## Earth orientation parameters

In geodesy, earth orientation parameters (EOP) are a collection of parameters that describe irregularities in the rotation of the Earth.

New!!: International Celestial Reference Frame and Earth orientation parameters · See more »

## Epoch (astronomy)

In astronomy, an epoch is a moment in time used as a reference point for some time-varying astronomical quantity, such as the celestial coordinates or elliptical orbital elements of a celestial body, because these are subject to perturbations and vary with time.

New!!: International Celestial Reference Frame and Epoch (astronomy) · See more »

## Extragalactic astronomy

Extragalactic astronomy is the branch of astronomy concerned with objects outside the Milky Way galaxy.

New!!: International Celestial Reference Frame and Extragalactic astronomy · See more »

## Frame of reference

In physics, a frame of reference (or reference frame) consists of an abstract coordinate system and the set of physical reference points that uniquely fix (locate and orient) the coordinate system and standardize measurements.

New!!: International Celestial Reference Frame and Frame of reference · See more »

## General relativity

General relativity (GR, also known as the general theory of relativity or GTR) is the geometric theory of gravitation published by Albert Einstein in 1915 and the current description of gravitation in modern physics.

New!!: International Celestial Reference Frame and General relativity · See more »

## Gravity

Gravity, or gravitation, is a natural phenomenon by which all things with mass or energy—including planets, stars, galaxies, and even light—are brought toward (or gravitate toward) one another.

New!!: International Celestial Reference Frame and Gravity · See more »

## Inertial frame of reference

An inertial frame of reference in classical physics and special relativity is a frame of reference in which a body with zero net force acting upon it is not accelerating; that is, such a body is at rest or it is moving at a constant speed in a straight line.

New!!: International Celestial Reference Frame and Inertial frame of reference · See more »

## International Astronomical Union

The International Astronomical Union (IAU; Union astronomique internationale, UAI) is an international association of professional astronomers, at the PhD level and beyond, active in professional research and education in astronomy.

New!!: International Celestial Reference Frame and International Astronomical Union · See more »

## International Celestial Reference System

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

New!!: International Celestial Reference Frame and International Celestial Reference System · See more »

## International Earth Rotation and Reference Systems Service

The International Earth Rotation and Reference Systems Service (IERS), formerly the International Earth Rotation Service, is the body responsible for maintaining global time and reference frame standards, notably through its Earth Orientation Parameter (EOP) and International Celestial Reference System (ICRS) groups.

New!!: International Celestial Reference Frame and International Earth Rotation and Reference Systems Service · See more »

## International Terrestrial Reference System

The International Terrestrial Reference System (ITRS) describes procedures for creating reference frames suitable for use with measurements on or near the Earth's surface.

New!!: International Celestial Reference Frame and International Terrestrial Reference System · See more »

## Ionosphere

The ionosphere is the ionized part of Earth's upper atmosphere, from about to altitude, a region that includes the thermosphere and parts of the mesosphere and exosphere.

New!!: International Celestial Reference Frame and Ionosphere · See more »

## Mean squared error

In statistics, the mean squared error (MSE) or mean squared deviation (MSD) of an estimator (of a procedure for estimating an unobserved quantity) measures the average of the squares of the errors—that is, the average squared difference between the estimated values and what is estimated.

New!!: International Celestial Reference Frame and Mean squared error · See more »

## Minute and second of arc

A minute of arc, arcminute (arcmin), arc minute, or minute arc is a unit of angular measurement equal to of one degree.

New!!: International Celestial Reference Frame and Minute and second of arc · See more »

## Noise floor

In signal theory, the noise floor is the measure of the signal created from the sum of all the noise sources and unwanted signals within a measurement system, where noise is defined as any signal other than the one being monitored.

New!!: International Celestial Reference Frame and Noise floor · See more »

## Quasar

A quasar (also known as a QSO or quasi-stellar object) is an extremely luminous active galactic nucleus (AGN).

New!!: International Celestial Reference Frame and Quasar · See more »

## Solar System

The Solar SystemCapitalization of the name varies.

New!!: International Celestial Reference Frame and Solar System · See more »

## Very-long-baseline interferometry

Very-long-baseline interferometry (VLBI) is a type of astronomical interferometry used in radio astronomy.

New!!: International Celestial Reference Frame and Very-long-baseline interferometry · See more »

## References

[1] https://en.wikipedia.org/wiki/International_Celestial_Reference_Frame