![]() 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. Density altitude – the density of the air in terms of altitude in the International Standard Atmosphere in the air.Pressure altitude – the air pressure in terms of altitude in the International Standard Atmosphere.Height – vertical distance above a certain point.True altitude – altitude in terms of elevation above sea level.Absolute altitude – altitude in terms of the distance above the ground directly below.Indicated altitude – the altitude shown on the altimeter.These types of altitude can be explained more simply as various ways of measuring the altitude: ![]() On a very hot day, density altitude at an airport (especially one at a high elevation) may be so high as to preclude takeoff, particularly for helicopters or a heavily loaded aircraft. Aircraft performance depends on density altitude, which is affected by barometric pressure, humidity and temperature. Density altitude is the altitude corrected for non-ISA International Standard Atmosphere atmospheric conditions.Pressure altitude and indicated altitude are the same when the altimeter setting is 29.92" Hg or 1013.25 millibars. in Class A airspace (above roughly 18,000 feet). Pressure altitude is used to indicate "flight level" which is the standard for altitude reporting in the U.S. Pressure altitude is the elevation above a standard datum air-pressure plane (typically, 1013.25 millibars or 29.92" Hg).In UK aviation radiotelephony usage, the vertical distance of a level, a point or an object considered as a point, measured from a specified datum this is referred to over the radio as height, where the specified datum is the airfield elevation (see QFE) ![]()
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