The tilt angle in degrees of the orbital plane with respect to
the earth's equatorial plane. Numbers less than 90 degrees represent
east-bound satellites, and greater than 90 degrees represent west-bound
High inclination (more than 50 degrees and less than 130 degrees, say)
represents a "polar" orbit. These satellites can be seen from high latitudes.
Low inclination (less than 40 or greater than 140 degrees) means the satellite
stays near the equator and may not be visible from high latitudes.
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