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==== Principal Meridians ==== | ==== Principal Meridians ==== | ||
The system is based on | The system is based on '''''principal meridians ''''' and '''''base lines ''''' determined by precise scientific measurements. | ||
A geographical term which refers to a reference line used in surveying and dividing land in certain parts of the U.S. The meridian numbers progress from low to high as they were surveyed from east to west. The meridian lines on either side of the principal meridian are twenty-four miles apart. [The New A to Zax, US/Can 973 D26e] | A geographical term which refers to a reference line used in surveying and dividing land in certain parts of the U.S. The meridian numbers progress from low to high as they were surveyed from east to west. The meridian lines on either side of the principal meridian are twenty-four miles apart. [The New A to Zax, US/Can 973 D26e] | ||