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Greenwich a borough of London, England, through which the prime meridian passes.
Greenwich time the solar time that is determined at the prime meridian through Greenwich, England, and that is used to calculate and regulate time throughout most of the world; Greenwich mean time.
hemisphere either of two halves of the terrestrial globe, formed by dividing it into northern and southern parts at the equator, or into eastern and western parts at the prime meridian. [1/3 definitions]
long. abbreviation of "longitude," the angular distance on the earth's surface east or west of the prime meridian at Greenwich, England, measured either in degrees or in hours, minutes, and seconds.
longitude the angular distance on the earth's surface east or west of the prime meridian at Greenwich, England, measured either in degrees or in hours, minutes, and seconds.
time zone any of twenty-four longitudinal divisions of the earth that are roughly defined by their distances from the prime meridian, and each of which keeps a standard time one hour earlier than does the zone to its east.