Parallels are arcs drawn parallel to the equator and at right angles to meridians, Each is numbered according to a system known as latitude. Values range from 0 degrees ( equator) to 90 degrees north or south
Every point on earth can be measured precisely using latitude and longitude
Further accuracy can be achieved by dividing each degree into 60 minutes and each minute into 60 seconds
Earth as a sphere is divided into 360 degrees of longitude
Divide 360 degrees by 24 time zones for each hour of day equals 15 degrees
Greenwich Means Time (GMT) is located at the prime meridian (0 degrees longitude)
Passes through Royal Observation at Greenwich England
Master reference time for all points on Earth
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