The Celestial Sphere information

navigation, the celestial sphere is an abstract sphere that has an arbitrarily large radius and is concentric to Earth. All objects in the sky can be conceived...

The celestial spheres, or celestial orbs, were the fundamental entities of the cosmological models developed by Plato, Eudoxus, Aristotle, Ptolemy, Copernicus...

armillary sphere (variations are known as spherical astrolabe, armilla, or armil) is a model of objects in the sky (on the celestial sphere), consisting...

of some other celestial body, or of the celestial sphere. Globes serve purposes similar to maps, but, unlike maps, they do not distort the surface that...

The celestial equator is the great circle of the imaginary celestial sphere on the same plane as the equator of Earth. By extension, it is also a plane...

a celestial sphere, if the object's distance is unknown or trivial. Spherical coordinates, projected on the celestial sphere, are analogous to the geographic...

different theories about the dynamics of the celestial spheres. They explained the motions of the various nested spheres in terms of the materials of which...

The northern celestial hemisphere, also called the Northern Sky, is the northern half of the celestial sphere; that is, it lies north of the celestial...

movement around the celestial sphere over the course of a year traces out a path along the ecliptic against the background of stars. The ecliptic is an...

rotation, indefinitely extended, intersects the celestial sphere. The north and south celestial poles appear permanently directly overhead to observers...

The southern celestial hemisphere, also called the Southern Sky, is the southern half of the celestial sphere; that is, it lies south of the celestial...

The Celestial Sphere is a large scale oratorio for chorus and orchestra by Charles Wuorinen, commissioned by Augustana College (Rock Island, Illinois)...

The zenith (UK: /ˈzɛnɪθ/, US: /ˈziːnɪθ/) is an imaginary point directly "above" a particular location, on the celestial sphere. "Above" means in the vertical...

sphere, is of the gnomonic projection inside of the celestial sphere, whereas the celestial globe is orthographic projection as viewed from the outside. For...

in equilibrium. The Earth is often approximated as a sphere in geography, and the celestial sphere is an important concept in astronomy. Manufactured items...

from the Sun at the March equinox i.e. the First Point of Aries, which is the place on the celestial sphere where the Sun crosses the celestial equator...

where the projection of a planet's axis of rotation intersects its celestial sphere Celestial sphere, an imaginary sphere concentric with the Earth –...

projection on the celestial equatorial plane.   The geographic south of the celestial sphere acts as the projection pole.   The celestial equatorial plane...

object upon the celestial sphere. hour circle Any imaginary great circle drawn upon the celestial sphere that passes through both of the celestial poles and...

the planets have their own motions, they also appear to revolve around Earth about once per day. The stars appeared to be fixed on a celestial sphere...

them. The great circle separating the hemispheres is called the celestial horizon, which is defined as the great circle on the celestial sphere whose...

is one of the two angles that locate a point on the celestial sphere in the equatorial coordinate system, the other being hour angle. The declination...

artists. The Celestial Sphere (also known as the Armillary Sphere) in the Ariana Park of the Palais des Nations is the best-known of these. The huge—over...

approximately on the position of the fixed stars on the theoretical celestial sphere. More exactly, sidereal time is the angle, measured along the celestial equator...

representation of the celestial sphere and the classical constellations. The sculpture is at the National Archaeological Museum of Naples, in Italy. The statue is...

apparent path of the Sun across the celestial sphere over the course of the year. Also within this zodiac belt appear the Moon and the brightest planets...

On the Revolutions of the Heavenly Spheres) is the seminal work on the heliocentric theory of the astronomer Nicolaus Copernicus (1473–1543) of the Polish...

the symbol ♈︎. Named for the constellation of Aries, it is one of the two points on the celestial sphere at which the celestial equator crosses the ecliptic...

In astronomy, the ecliptic coordinate system is a celestial coordinate system commonly used for representing the apparent positions, orbits, and pole orientations...