In the accompanying diagram, a spherical coordinates system is shown defining point P in terms of distance r and angles θ and φ. (2) The spherical triangle ABC has "sides" a, b, c which are the angles BOC, AOC, and AOB respectively and "angles" A, B, C where A is the angle between the tangents to the arcs AC and AB at A; B that between the tangents to the arcs AB and BC at B; and C that between the tangents to the arcs AC and BC at C respectively.
Related categories• GEOMETRY
• CELESTIAL MECHANICS
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