: Astronomie: position angle

mathematical technique > frame of reference > coordinate system > astronomical coordinate > position angle

astronomical technique > astrometry > coordinate system > astronomical coordinate > position angle

classical mechanics aspects > celestial mechanics > orbit > orbital element > position angle

position angle

In astronomy, position angle (usually abbreviated PA) is the convention for measuring angles on the sky. The International Astronomical Union defines it as the angle measured relative to the north celestial pole (NCP), turning positive into the direction of the right ascension. In the standard (non-flipped) images, this is a counterclockwise measure relative to the axis into the direction of positive declination. In the case of observed visual binary stars, it is defined as the angular offset of the secondary star from the primary relative to the north celestial pole. (Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Position_angle)

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