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celestial coordinate system click to hear : celestial coordinate system

Imaginary horizontal and vertical lines used to describe the position of an object on the celestial sphere.
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See celestial coordinate system in : french | spanish
North celestial pole declination ecliptic right ascension celestial meridian celestial sphere celestial equator terrestrial sphere vernal equinox South celestial pole Equator inclination

North celestial pole click to hear : North celestial pole

Projection of the North terrestrial pole onto the celestial sphere.

declination click to hear : declination

One of two coordinates used to locate a celestial body on the celestial sphere; similar to terrestrial latitude.

ecliptic click to hear : ecliptic

Projection of the Sun’s apparent annual path onto the celestial sphere.

right ascension click to hear : right ascension

One of two coordinates used to locate a celestial body on the celestial sphere; similar to terrestrial longitude.

celestial meridian click to hear : celestial meridian

Projection of a terrestrial meridian onto the celestial sphere.

celestial sphere click to hear : celestial sphere

Imaginary sphere where celestial bodies are observed and positioned.

celestial equator click to hear : celestial equator

Projection of the terrestrial Equator onto the celestial sphere; serves as the point of origin for declinations.

terrestrial sphere click to hear : terrestrial sphere

Shape of Earth whose coordinates are projected onto the celestial sphere.

vernal equinox click to hear : vernal equinox

Point at which the ecliptic and the celestial equator intersect; serves as the point of origin for right ascensions.

South celestial pole click to hear : South celestial pole

Projection of the South terrestrial pole onto the celestial sphere.

Equator click to hear : Equator

Imaginary circle surrounding Earth at its widest circumference, dividing it into two hemispheres: the Northern hemisphere and the Southern hemisphere.

inclination click to hear : inclination

Angle formed between an imaginary line connecting the terrestrial poles and an imaginary line perpendicular to the ecliptic.