Argument of Perigee
There are two special points on the orbit, in addition to the ascending
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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