true altitude
true altitude
[′trü ′al·tə‚tüd]True Altitude
(also, absolute altitude), in geodesy, the distance along a vertical from a given point on the surface of the earth to sea level. It is determined by leveling. In the USSR, true altitude is calculated from zero on the depth gauge in Kronstadt.
true altitude
ii. The actual altitude of a celestial body above the celestial horizon. The observed altitude must be corrected for several variables before it becomes the true altitude.
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