Orbit Altitude
Orbits can be distinguished by their altitudes from the Earth's surface. (National Aeronautics and Space Administration, 2009)
Sources
"Three Classes of Orbit". Earth Observatory, National Aeronautics and Space Administration. Last modified September 4, 2009.
https://earthobservatory.nasa.gov/features/OrbitsCatalog/page2.php.
Accessed February 13, 2019.