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The geographical longitude is one of the fundamental coordinates that determine the location of a point on Earth (the other coordinate is Latitude).

The length is the angle formed between the meridian that passes through the point considered and the fundamental Greenwich meridian chosen, by convention, as the origin of this geographical coordinate.

It is measured from 0 degrees to 180 degrees east or west with respect to Greewich.

The celestial length is the angular distance of a body with respect to the first point of Aries measured clockwise along the Ecliptica.

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