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declination

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  1. [measurement, coordinate systems] In a spherical coordinate system, the angle between the equatorial plane and a line to a point somewhere on the sphere.

    Media/declination.gif
  2. [geometry] The arc between the equator and a point on a great circle perpendicular to the equator.

  3. [aerospace] The angular distance between a star or planet and the celestial equator.

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