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With an altazimuth mount, those directions are rotated by the amount of the parallactic angle. 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”, en.wikipedia.org
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”, en.wikipedia.org
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”, en.wikipedia.org