observed altitude
1altitude difference — The difference between computed and observed altitudes, or between precomputed and sextant altitude. Also called altitude intercept …
2true altitude — i. The actual height above sea level. The calibrated altitude corrected for air temperature. See altitude. ii. The actual altitude of a celestial body above the celestial horizon. The observed altitude must be corrected for several variables… …
3Minimum safety altitude — Altitude specified at the flight planning stage as the minimum altitude that can be descended to in order to maintain safe terrain separation. Generally, for VFR flight, a safe margin would be; Take a terrain elevation of 1,250 ft above mean sea… …
4Meridian altitude — is an astronomical navigation method of calculating an observer s latitude. Contents 1 Principle 2 Methodology 3 See also 4 References …
5High altitude nuclear explosion — High altitude nuclear explosions have historically been nuclear explosions which take place above altitudes of 50 km, still inside the Earth s atmosphere. Such explosions have been tests of nuclear weapons, used to determine the effects of the… …
6intercept altitude — As used in astronavigation, it is the difference between the minutes of an arc, between computed and observed altitudes, or between precomputed and sextant altitudes. It is labeled T (toward) or A (away), as the observed or sextant altitude is… …
7calculated altitude — The celestial angle between a celestial body and the observer’s horizon calculated mathematically or observed from a given position on the earth at a given time …
8Intercept method — The Intercept Method , or Marcq St Hilaire method , as it is also rather inaccurately known, is an astronomical navigation method of calculating an observer s position on earth. It was originally called the azimuth intercept method because the… …
9sandwich fix — A fixing method that dispenses with the transfer of position lines, and so facilitates plotting, is a sandwich fix. The observed altitude of a body varies linearly with time, except near or during meridian passage time. Hence, if two sights are… …
10noon fix — A positional fix obtained from any celestial body (generally the sun) that is close to the observer’s zenith. Such a fix generally is obtained at a time when the observed altitude of a body is greatest, as it is then practical to plot the line of …
