26 relations: Asteroid, Barycenter, Barycentric Dynamical Time, Comet, Coordinate time, Ephemeris time, French language, General relativity, Geocentric Coordinate Time, Geocentric coordinates, Gravitational potential, Gravitational time dilation, Gravity well, Gregorian calendar, International Astronomical Union, International Atomic Time, Julian day, Metric tensor (general relativity), Planet, Proper frame, Proper time, Solar System, Spacecraft, Sun, Terrestrial Time, Time standard.
Asteroid
Asteroids are minor planets, especially those of the inner Solar System.
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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.
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Barycentric Dynamical Time
Barycentric Dynamical Time (TDB, from the French Temps Dynamique Barycentrique) is a relativistic coordinate time scale, intended for astronomical use as a time standard to take account of time dilation when calculating orbits and astronomical ephemerides of planets, asteroids, comets and interplanetary spacecraft in the Solar System.
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Comet
A comet is an icy small Solar System body that, when passing close to the Sun, warms and begins to release gases, a process called outgassing.
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Coordinate time
In the theory of relativity, it is convenient to express results in terms of a spacetime coordinate system relative to an implied observer.
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Ephemeris time
The term ephemeris time (often abbreviated ET) can in principle refer to time in connection with any astronomical ephemeris.
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French language
French (le français or la langue française) is a Romance language of the Indo-European family.
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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.
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Geocentric Coordinate Time
Geocentric Coordinate Time (TCG - Temps-coordonnée géocentrique) is a coordinate time standard intended to be used as the independent variable of time for all calculations pertaining to precession, nutation, the Moon, and artificial satellites of the Earth.
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Geocentric coordinates
Geocentric coordinates are an Earth-centered system of locating astronomical objects in the Solar System in three dimensions along the Cartesian X, Y, and Z axes.
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Gravitational potential
In classical mechanics, the gravitational potential at a location is equal to the work (energy transferred) per unit mass that would be needed to move the object from a fixed reference location to the location of the object.
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Gravitational time dilation
Gravitational time dilation is a form of time dilation, an actual difference of elapsed time between two events as measured by observers situated at varying distances from a gravitating mass.
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Gravity well
A gravity well or gravitational well is a conceptual model of the gravitational field surrounding a body in space – the more massive the body, the deeper and more extensive the gravity well associated with it.
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Gregorian calendar
The Gregorian calendar is the most widely used civil calendar in the world.
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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.
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International Atomic Time
International Atomic Time (TAI, from the French name temps atomique international) is a high-precision atomic coordinate time standard based on the notional passage of proper time on Earth's geoid.
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Julian day
Julian day is the continuous count of days since the beginning of the Julian Period and is used primarily by astronomers.
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Metric tensor (general relativity)
In general relativity, the metric tensor (in this context often abbreviated to simply the metric) is the fundamental object of study.
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Planet
A planet is an astronomical body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighbouring region of planetesimals.
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Proper frame
A proper frame, or comoving frame, is a frame of reference that is attached to an object.
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Proper time
In relativity, proper time along a timelike world line is defined as the time as measured by a clock following that line.
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Solar System
The Solar SystemCapitalization of the name varies.
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Spacecraft
A spacecraft is a vehicle or machine designed to fly in outer space.
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Sun
The Sun is the star at the center of the Solar System.
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Terrestrial Time
Terrestrial Time (TT) is a modern astronomical time standard defined by the International Astronomical Union, primarily for time-measurements of astronomical observations made from the surface of Earth.
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Time standard
A time standard is a specification for measuring time: either the rate at which time passes; or points in time; or both.
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References
[1] https://en.wikipedia.org/wiki/Barycentric_Coordinate_Time