61 relations: Astronomical nutation, Astronomical object, Astronomical unit, Astronomy, Axial precession, Basis (linear algebra), Cambridge University Press, Cartesian coordinate system, Celestial coordinate system, Celestial equator, Celestial sphere, Culmination, Declination, Distance, Earth, Earth's rotation, Earth-centered inertial, Ecliptic, Ephemeris, Epoch (astronomy), Equator, Equatorial mount, Equinox, Equinox (celestial coordinates), Fixed stars, Fundamental plane (spherical coordinates), Geocentric model, Geographical pole, Handedness, Horizontal coordinate system, Hour angle, Hour circle, International Celestial Reference Frame, Latitude, Longitude, Meridian (astronomy), Meridian circle, Orbit, Orbital mechanics, Orientation (geometry), Origin (mathematics), Plane (geometry), Planet, Polar distance (astronomy), Position of the Sun, Projective geometry, Right ascension, Right-hand rule, Satellite, Setting circles, ..., Sidereal time, Solar System, Solar time, Spherical astronomy, Spherical coordinate system, Star, Star chart, Sun, Telescope, Transparency and translucency, Unit vector. Expand index (11 more) »
Astronomical nutation
Astronomical nutation is a phenomenon which causes the orientation of the axis of rotation of a spinning astronomical object to vary over time.
New!!: Equatorial coordinate system and Astronomical nutation · 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!!: Equatorial coordinate system and Astronomical object · See more »
Astronomical unit
The astronomical unit (symbol: au, ua, or AU) is a unit of length, roughly the distance from Earth to the Sun.
New!!: Equatorial coordinate system and Astronomical unit · See more »
Astronomy
Astronomy (from ἀστρονομία) is a natural science that studies celestial objects and phenomena.
New!!: Equatorial coordinate system and Astronomy · See more »
Axial precession
In astronomy, axial precession is a gravity-induced, slow, and continuous change in the orientation of an astronomical body's rotational axis.
New!!: Equatorial coordinate system and Axial precession · See more »
Basis (linear algebra)
In mathematics, a set of elements (vectors) in a vector space V is called a basis, or a set of, if the vectors are linearly independent and every vector in the vector space is a linear combination of this set.
New!!: Equatorial coordinate system and Basis (linear algebra) · See more »
Cambridge University Press
Cambridge University Press (CUP) is the publishing business of the University of Cambridge.
New!!: Equatorial coordinate system and Cambridge University Press · See more »
Cartesian coordinate system
A Cartesian coordinate system is a coordinate system that specifies each point uniquely in a plane by a pair of numerical coordinates, which are the signed distances to the point from two fixed perpendicular directed lines, measured in the same unit of length.
New!!: Equatorial coordinate system and Cartesian coordinate system · See more »
Celestial coordinate system
In astronomy, a celestial coordinate system is a system for specifying positions of celestial objects: satellites, planets, stars, galaxies, and so on.
New!!: Equatorial coordinate system and Celestial coordinate system · See more »
Celestial equator
The celestial equator is the great circle of the imaginary celestial sphere on the same plane as the equator of Earth.
New!!: Equatorial coordinate system and Celestial equator · See more »
Celestial sphere
In astronomy and navigation, the celestial sphere is an abstract sphere with an arbitrarily large radius concentric to Earth.
New!!: Equatorial coordinate system and Celestial sphere · See more »
Culmination
In astronomy, the culmination of a planet, star, or constellation is its transit over an observer's meridian.
New!!: Equatorial coordinate system and Culmination · See more »
Declination
In astronomy, declination (abbreviated dec; symbol δ) is one of the two angles that locate a point on the celestial sphere in the equatorial coordinate system, the other being hour angle.
New!!: Equatorial coordinate system and Declination · See more »
Distance
Distance is a numerical measurement of how far apart objects are.
New!!: Equatorial coordinate system and Distance · See more »
Earth
Earth is the third planet from the Sun and the only astronomical object known to harbor life.
New!!: Equatorial coordinate system and Earth · See more »
Earth's rotation
Earth's rotation is the rotation of Planet Earth around its own axis.
New!!: Equatorial coordinate system and Earth's rotation · See more »
Earth-centered inertial
Earth-centered inertial (ECI) coordinate frames have their origins at the center of mass of the Earth.
New!!: Equatorial coordinate system and Earth-centered inertial · See more »
Ecliptic
The ecliptic is the circular path on the celestial sphere that the Sun follows over the course of a year; it is the basis of the ecliptic coordinate system.
New!!: Equatorial coordinate system and Ecliptic · See more »
Ephemeris
In astronomy and celestial navigation, an ephemeris (plural: ephemerides) gives the positions of naturally occurring astronomical objects as well as artificial satellites in the sky at a given time or times.
New!!: Equatorial coordinate system and Ephemeris · 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!!: Equatorial coordinate system and Epoch (astronomy) · See more »
Equator
An equator of a rotating spheroid (such as a planet) is its zeroth circle of latitude (parallel).
New!!: Equatorial coordinate system and Equator · See more »
Equatorial mount
An equatorial mount is a mount for instruments that compensates for Earth's rotation by having one rotational axis parallel to the Earth's axis of rotation.
New!!: Equatorial coordinate system and Equatorial mount · See more »
Equinox
An equinox is commonly regarded as the moment the plane (extended indefinitely in all directions) of Earth's equator passes through the center of the Sun, which occurs twice each year, around 20 March and 22-23 September.
New!!: Equatorial coordinate system and Equinox · See more »
Equinox (celestial coordinates)
In astronomy, equinox is a moment when the vernal point, celestial equator, and other such elements are taken to be used in the definition of a celestial coordinate system.
New!!: Equatorial coordinate system and Equinox (celestial coordinates) · See more »
Fixed stars
The fixed stars (stellae fixae) comprise the background of astronomical objects that appear to not move relative to each other in the night sky compared to the foreground of Solar System objects that do.
New!!: Equatorial coordinate system and Fixed stars · See more »
Fundamental plane (spherical coordinates)
The fundamental plane in a spherical coordinate system is a plane of reference that divides the sphere into two hemispheres.
New!!: Equatorial coordinate system and Fundamental plane (spherical coordinates) · See more »
Geocentric model
In astronomy, the geocentric model (also known as geocentrism, or the Ptolemaic system) is a superseded description of the universe with Earth at the center.
New!!: Equatorial coordinate system and Geocentric model · See more »
Geographical pole
A geographical pole is either of the two points on a rotating body (planet, dwarf planet, natural satellite, sphere...etc) where its axis of rotation intersects its surface.
New!!: Equatorial coordinate system and Geographical pole · See more »
Handedness
In human biology, handedness is a better, faster, or more precise performance or individual preference for use of a hand, known as the dominant hand; the less capable or less preferred hand is called the non-dominant hand.
New!!: Equatorial coordinate system and Handedness · See more »
Horizontal coordinate system
The horizontal coordinate system is a celestial coordinate system that uses the observer's local horizon as the fundamental plane.
New!!: Equatorial coordinate system and Horizontal coordinate system · See more »
Hour angle
In astronomy and celestial navigation, the hour angle is one of the coordinates used in the equatorial coordinate system to give the direction of a point on the celestial sphere.
New!!: Equatorial coordinate system and Hour angle · See more »
Hour circle
In astronomy, the hour circles, which together with declination and distance (from the centre of mass of the planet) locate any celestial object, is the great circle through the object and the two celestial poles.
New!!: Equatorial coordinate system and Hour circle · See more »
International Celestial Reference Frame
In astrometry, an International Celestial Reference Frame (ICRF) is a realization of the International Celestial Reference System (ICRS) using reference celestial sources observed at radio wavelengths.
New!!: Equatorial coordinate system and International Celestial Reference Frame · See more »
Latitude
In geography, latitude is a geographic coordinate that specifies the north–south position of a point on the Earth's surface.
New!!: Equatorial coordinate system and Latitude · See more »
Longitude
Longitude, is a geographic coordinate that specifies the east-west position of a point on the Earth's surface.
New!!: Equatorial coordinate system and Longitude · See more »
Meridian (astronomy)
In astronomy, the meridian is the great circle passing through the celestial poles, the zenith, and the nadir of an observer's location.
New!!: Equatorial coordinate system and Meridian (astronomy) · See more »
Meridian circle
The meridian circle is an instrument for timing of the passage of stars across the local meridian, an event known as a culmination, while at the same time measuring their angular distance from the nadir.
New!!: Equatorial coordinate system and Meridian circle · See more »
Orbit
In physics, an orbit is the gravitationally curved trajectory of an object, such as the trajectory of a planet around a star or a natural satellite around a planet.
New!!: Equatorial coordinate system and Orbit · See more »
Orbital mechanics
Orbital mechanics or astrodynamics is the application of ballistics and celestial mechanics to the practical problems concerning the motion of rockets and other spacecraft.
New!!: Equatorial coordinate system and Orbital mechanics · See more »
Orientation (geometry)
In geometry the orientation, angular position, or attitude of an object such as a line, plane or rigid body is part of the description of how it is placed in the space it occupies.
New!!: Equatorial coordinate system and Orientation (geometry) · See more »
Origin (mathematics)
In mathematics, the origin of a Euclidean space is a special point, usually denoted by the letter O, used as a fixed point of reference for the geometry of the surrounding space.
New!!: Equatorial coordinate system and Origin (mathematics) · See more »
Plane (geometry)
In mathematics, a plane is a flat, two-dimensional surface that extends infinitely far.
New!!: Equatorial coordinate system and Plane (geometry) · See more »
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.
New!!: Equatorial coordinate system and Planet · See more »
Polar distance (astronomy)
In the celestial equatorial coordinate system Σ(α, δ) in astronomy, polar distance (PD) is an angular distance of a celestial object on its meridian measured from the celestial pole, similar to the way declination (dec, δ) is measured from the celestial equator.
New!!: Equatorial coordinate system and Polar distance (astronomy) · See more »
Position of the Sun
The position of the Sun in the sky is a function of both the time and the geographic location of observation on Earth's surface.
New!!: Equatorial coordinate system and Position of the Sun · See more »
Projective geometry
Projective geometry is a topic in mathematics.
New!!: Equatorial coordinate system and Projective geometry · See more »
Right ascension
Right ascension (abbreviated RA; symbol) is the angular distance measured only eastward along the celestial equator from the Sun at the March equinox to the (hour circle of the) point above the earth in question.
New!!: Equatorial coordinate system and Right ascension · See more »
Right-hand rule
In mathematics and physics, the right-hand rule is a common mnemonic for understanding orientation conventions for the vector cross product in three dimensions.
New!!: Equatorial coordinate system and Right-hand rule · See more »
Satellite
In the context of spaceflight, a satellite is an artificial object which has been intentionally placed into orbit.
New!!: Equatorial coordinate system and Satellite · See more »
Setting circles
Setting circles are used on telescopes equipped with an equatorial mount to find astronomical objects in the sky by their equatorial coordinates often used in star charts or ephemerides.
New!!: Equatorial coordinate system and Setting circles · See more »
Sidereal time
Sidereal time is a timekeeping system that astronomers use to locate celestial objects.
New!!: Equatorial coordinate system and Sidereal time · See more »
Solar System
The Solar SystemCapitalization of the name varies.
New!!: Equatorial coordinate system and Solar System · See more »
Solar time
Solar time is a calculation of the passage of time based on the position of the Sun in the sky.
New!!: Equatorial coordinate system and Solar time · See more »
Spherical astronomy
Spherical astronomy or positional astronomy is the branch of astronomy that is used to determine the location of objects on the celestial sphere, as seen at a particular date, time, and location on Earth.
New!!: Equatorial coordinate system and Spherical astronomy · See more »
Spherical coordinate system
In mathematics, a spherical coordinate system is a coordinate system for three-dimensional space where the position of a point is specified by three numbers: the radial distance of that point from a fixed origin, its polar angle measured from a fixed zenith direction, and the azimuth angle of its orthogonal projection on a reference plane that passes through the origin and is orthogonal to the zenith, measured from a fixed reference direction on that plane.
New!!: Equatorial coordinate system and Spherical coordinate system · See more »
Star
A star is type of astronomical object consisting of a luminous spheroid of plasma held together by its own gravity.
New!!: Equatorial coordinate system and Star · See more »
Star chart
A star chart or star map, also called a sky chart or sky map, is a map of the night sky.
New!!: Equatorial coordinate system and Star chart · See more »
Sun
The Sun is the star at the center of the Solar System.
New!!: Equatorial coordinate system and Sun · See more »
Telescope
A telescope is an optical instrument that aids in the observation of remote objects by collecting electromagnetic radiation (such as visible light).
New!!: Equatorial coordinate system and Telescope · See more »
Transparency and translucency
In the field of optics, transparency (also called pellucidity or diaphaneity) is the physical property of allowing light to pass through the material without being scattered.
New!!: Equatorial coordinate system and Transparency and translucency · See more »
Unit vector
In mathematics, a unit vector in a normed vector space is a vector (often a spatial vector) of length 1.
New!!: Equatorial coordinate system and Unit vector · See more »
Redirects here:
Equatorial Coordinates, Equatorial coordinates, RA/Dec.
References
[1] https://en.wikipedia.org/wiki/Equatorial_coordinate_system