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Angular distance from a star to the celestial equator. It is valid to state that it corresponds to the concept of latitude on the surface of the Earth.

In a given celestial object, a circle that crosses the object and the celestial poles is called the declination circle. A declination circle is used as a reference - the same as the 0 ° longitude on Earth - which is the circle that crosses the celestial poles and the point of the celestial equator where the March equinox crosses the ecliptic.

The angle, from west to east, from this reference declination circle to the celestial object's declination circle is the straight ascension of the object, which is measured in hours. The angle from the equator to the object along the declination circle is the declination of the object, which is measured in degrees. Straight ascension and declination are analogous to terrestrial longitude and latitude.

Also called declination, in this case, "magnetic declination", the angle formed by the horizontal component of the earth's magnetic field (magnetic meridian) with the geographic meridian.

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