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File:Position Angle - Spherical Triangle for Derivation.png

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English: Diagram showing the spherical triangle used for deriving the formula for the astronomical position angle of point 1 with respect to point 2. The corners of the triangle are the north celestial pole N, point 1 (with celestial coordinates alpha1 and delta1) and point 2 (with celestial coordinates alpha2 and delta2). The angle P at point 2 is the position angle of point 1 with respect to point 2. A formula for P can be derived, applying spherical trigonometry to this triangle.
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16 September 2011

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current22:34, 16 September 2011Thumbnail for version as of 22:34, 16 September 2011730 × 900 (18 KB)Sch{{Information |Description ={{en|1=Diagram showing the spherical triangle used for deriving the formula for the astronomical position angle of point 1 with respect to point 2. The corners of the triangle are the north celestial pole N, point 1 (with ce

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