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planetary hours: system of hour reckoning, see article on time and date.
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planetary temperaments: astrological character of the fixed stars; as assigned in classical astrology, each star had a nature and effect similar to one or more of the planets.
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planisphere: a representation of a spherical body on a flat surface, commonly a map of the earth or of the heavens.
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planispheric astrolabe: astronomical instrument based on a planispheric projection of the heavens, see article on the astrolabe.
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plate: part of an astrolabe with a projection of altitude and azimuth lines on to the equatorial plane, see article on the astrolabe.
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