High Quality Content by WIKIPEDIA articles! Depending on the type
of mount of the telescope, this angle may also affect the
orientation of the celestial object's disk as seen in a telescope.
With an equatorial mount, the cardinal points of the celestial
object's disk are aligned with the vertical and horizontal
direction of the view in the telescope. 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.
In other words, they are not cardinal points defined by the
object's axis of rotation.
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