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  • With an altazimuth mount, those directions are rotated by the amount of the parallactic angle.[2] The cardinal points here referred to is the points on the limb located such that a line from the center of the disk through them will point to one of the celestial poles or 90° away from them. — “Parallactic angle - Wikipedia, the free encyclopedia”,
  • When the viewpoint is changed to "Viewpoint B", the object appears to This animation is an example of parallax. As the viewpoint moves side to side, the. — “Parallax - Wikipedia, the free encyclopedia”,
  • Also known as Parallactic Rulers, it was used for determining altitudes of heavenly Ptolemy calls it a "parallactic instrument" and seems to have used it to determine the. — “Triquetrum (astronomy) - Wikipedia, the free encyclopedia”,


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