The orbital inclination of a body (usually a satellite or spacecraft) is a descriptor of its course in orbit around another body, typically the earth. It ranges from zero to 360 degrees, where zero degrees is a perfectly equatorial (although not necessarily geosynchronous due to altitude variation) orbit, and 90 or 270 degrees is a perfectly circumpolar orbit. Between 90 and 270 degrees is considered a retrograde orbit.

The second Keplerian orbital element, specifying the angle, from 0° to 180°, between the equatorial plane, and the plane of the satellite's orbit. Expressed in most formats as DDD.FFFF, (Degrees.Fractionaldegrees).

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