Of or pertaining to azimuth
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HORIZON SYSTEM OF COORDINATES
A set of celestial coordinates based on the celestial horizon as the primary great circle; usually altitude and azimuth or azimuth angle.
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HORIZONTAL GEODETIC DATUM
The basis for computations of horizontal control surveys in which the curvature of the earth is considered It consists of the astronomical and geodetic latitude and the astronom- ical and geodetic longitude of an initial point (origin); an azimuth of a line from this point; the parameters (radius and flattening) of the reference ellipsoid; and the geoidal separation at the origin. A change in any of these quantities affects every point on the datum. For this reason, while positions within a system are directly and accurately relatable, those points from different datums must be transformed to a common datum for consistency. The horizontal geodetic datum may extend over a continent or be limited to a small area.
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AZIMUTH
The bearing of an object from the observer measured as an angle clockwise from true north.
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ALTITUDE AZIMUTH
An azimuth determined by solution of the naviga- tional triangle with altitude, declination, and latitude given. A time azimuth is computed with meridian angle, declination, and latitude given. A time and altitude azimuth is computed with meridian angle, declination, and altitude given
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ASTRO-TRACKER
A navigation equipment which automatically acquires and continuously tracks a celestial body in azimuth and altitude.
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MAGNETIC AZIMUTH
Azimuth relative to magnetic north.
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AZIMUTHAL CHART
A chart on an azimuthal map projection. Also called ZENITHAL CHART
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AZIMUTHAL EQUIDISTANT CHART
A chart on the azimuthal equidistant map projection. azimuthal equidistant map projecti
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AZIMUTHAL MAP PROJECTION
A map projection on which the azimuths or directions of all lines radiating from a central point or pole are the same as the azimuths or directions of the corresponding lines on the ellipsoid. This classification includes the gnomonic, stereographic, orthographic, and the azimuthal equidistant map projections. Also called ZENITHAL MAP PROJECTION.
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AZIMUTH TABLES
Publications providing tabulated azimuths or azimuth angles of celestial bodies for various combinations of declination, latitude and hour angle. Great circle course angles can also be obtained by substitution of values.
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