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Argument of Perigee

There are two special points on the orbit, in addition to the ascending and descending nodes or equator crossings. These special points are apogee and perigee - the highest (apo) and lowest (peri) altitude points of the orbit. If the elliptical orbit's major axis is rotated away from the equator, then perigee will come at some time other than the ascending or descending node. The angle of this rotation - the angle in degrees from the equator to perigee - is the Argument of Perigee.
Don't confuse this with the Right Ascension of Ascending Node.

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