Prime meridian

Prime Meridian
Science / Astrology / Prime Meridian
Prime Meridian: The great circle that passes through Earth's poles and Greenwich, England (0° longitude), from which longitude is measured east and west.

Prime Meridian The line of longitude that passes through Greenwich, England, and that is the zero line for expressing longitude on the Earth's surface.

prime meridian The great circle that passes through Earth's poles and Greenwich, England (0° longitude), from which longitude is measured east and west. See also longitude, geographical or terrestrial.

This is our celestial prime meridian as it were, and represents the line (or plane) of 0º celestial latitude.

Longitude, Geographical Or Terrestrial: The distance in arc a given point on Earth lies east or west of the prime meridian, which passes through Greenwich, England (0° longitude). Geographical longitude is measured from 0° to 180°.

GMT - Greenwich Mean Time. This is Universal Time, the time at the prime meridian.
Heliocentric - Heliocentric is just like the scientific way, the planets revolve around the sun.

Greenwich Mean Time: Refers to time at the prime meridian at zero degrees longitude.
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Heliocentric: A Sun centered perspective.

See also: Astrology, Earth, Meridian, House, Fire