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The point which is elevated 90 degrees from all points on a given observer's astronomical horizon. The point on any given observer's celestial sphere that lies directly above him. The opposite of nadir.
The position of the sun during the course of the year as it appears to move though successive constellations. Also, the band where the ecliptic runs centrally through the celestial sphere and contains the sun, the moon, and all the planets except Venus and Pluto.
The flow of air along a latitudinal component of existing flow, normally from west to east. Contrast with meridional flow.
The measure of the strength of the westerly winds of the middle latitudes. It is expressed as the horizontal pressure difference between 35 degrees and 55 degrees latitude, or as the corresponding geostrophic wind.
One of several names for the twenty-four hour time which is used throughout the scientific and military communities. Other names for this time measurement are Universal Time Coordinate (UTC) or Greenwich Mean Time (GMT).

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Branick, Michael. NOAA Technical Memorandum NWS SR-145, A Comprehensive Glossary of Weather Terms for Storm Spotters. U.S. Department of Commerce, 1995.

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National Weather Service Observing Handbook No. 7, Surface Weather Observations and Reports. U.S. Department of Commerce, 1996.