![]() ![]() A special case of high Earth orbit is the highly elliptical orbit, where altitude at perigee is less than 2,000 kilometres (1,200 mi). High Earth orbit (HEO) Geocentric orbits with altitudes at apogee higher than that of the geosynchronous orbit. The speed is approximately 3,000 metres per second (9,800 ft/s). The period of the orbit equals one sidereal day, coinciding with the rotation period of the Earth. Geosynchronous orbit (GEO) Geocentric circular orbit with an altitude of 35,786 kilometres (22,236 mi). Medium Earth orbit (MEO) Geocentric orbits with altitudes at apogee ranging between 2,000 kilometres (1,200 mi) and that of the geosynchronous orbit at 35,786 kilometres (22,236 mi). At 160 km, one revolution takes approximately 90 minutes, and the circular orbital speed is 8,000 metres per second (26,000 ft/s). Low Earth orbit (LEO) Geocentric orbits ranging in altitude from 160 kilometers (100 statute miles) to 2,000 kilometres (1,200 mi) above mean sea level. The green dashed line is the 20,230 km orbit used for GPS satellites. The black dashed line is the geosynchronous orbit. Low (cyan) and Medium (yellow) Earth orbit regions to scale.
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