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Z
- ZENITH
- 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.
- ZODIAC
- 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.
- ZONAL FLOW
- The flow of air along a latitudinal component of existing flow, normally from west to east.
- Related term: meridional flow
- ZONAL INDEX
- 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.
- ZULU TIME
- One of several names for the twenty-four hour time which is used throughout the scientific and military communities.
- Related terms: Universal Time Coordinate (UTC) and Greenwich Mean Time (GMT)
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