 | Nathaniel Bowditch - Nautical astronomy - 1906 - 670 pages
...same side of the horizon as the zenith. The altitude of the point M is HM. ¿221. The Zenith Distance of any point is its angular distance from the zenith,...must therefore equal 90° minus the altitude. The zenith distance of M, in the figure, is ZM. 222. The Hour Angle of any point is the angle at the pole... | |
 | Nathaniel Bowditch - Nautical astronomy - 1916 - 912 pages
...same side of the horizon as the zenith. The altitude of the point M is HM. 221. The Zenith Distance of any point is its angular distance from the zenith,...must therefore equal 90° minus the altitude. The zenith distance of M, in the figure, is ZM. 222. The Hour Angle of any point is the angle at the pole... | |
 | Nathaniel Bowditch - Nautical astronomy - 1931 - 866 pages
...same side of the horizon as the zenith. The altitude of the point M is HM. 221. The Zenith Distance of any point is its angular distance from the zenith,...must therefore equal 90° minus the altitude. The zenith distance of M, in the figure, is ZM. 222. The Hour Angle of any point is the angle at the pole... | |
 | United States. Army. Air Corps - Navigation (Aeronautics) - 1941 - 244 pages
...corrected for all the errors of observation true observed altitude (H0) results. ./. Zenith distance of any point is its angular distance from the zenith...through the point. The zenith distance of any point that is above the horizon is therefore equal to 90° minus the altitude. g. Azimuth (Az or Z) of any... | |
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The Zenith Distance of any point is its angular distance from the zenith, measured upon the vertical circle passing through the point; the zenith distance of any point which is above the horizon of an observer must therefore equal 90° minus the altitude. 