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Azimuth is measured eastward from the north point (sometimes from the south point) of the horizon; altitude is the angle above the horizon. The horizontal coordinate system is a celestial coordinate system that uses the observer's local horizon as the fundamental plane to define two angles of a spherical coordinate system: altitude and azimuth.
In astronomy, the altitude in the horizontal coordinate system and the zenith angle are complementary angles, with the horizon perpendicular to the zenith. The astronomical meridian is also determined by the zenith, and is defined as a circle on the celestial sphere that passes through the zenith, nadir, and the celestial poles.
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The Horizon (Russian: Горизонт) is a mechanical swing-lens panoramic camera. It is manufactured by Krasnogorsky Mechanicheskiy Zavod (KMZ) in Krasnogorsk , Russia , better-known for their range of Zenit cameras.
Diagram showing the relationship between the zenith, the nadir, and different types of horizon.Note that the zenith is opposite the nadir. The nadir [a] [b] is the direction pointing directly below a particular location; that is, it is one of two vertical directions at a specified location, orthogonal to a horizontal flat surface.
pairs of constellations which are simultaneously at the zenith and at the horizon; the path of the moon and planets. a solar calendar; the planets and the durations of their solar conjunctions; stellar risings and planetary positions for predicting weather and for adjusting the calendar; telling time by length of the gnomon shadow
Zenith Data Systems Corporation (ZDS) was an American computer systems manufacturing company active from 1979 to 1996.It was originally a division of the Zenith Radio Company (later Zenith Electronics), after they had purchased the Heath Company and, by extension, their Heathkit line of electronic kits and kit microcomputers, from Schlumberger in October 1979.