A principal meridian is a meridian used for survey control in a large region. == Canada == The Dominion Land Survey of Western Canada took its origin at the First (or Principal) Meridian, located at 97°27′28.41″ west of Greenwich, just west of Winnipeg, Manitoba.
A principal meridian is a meridian used for survey control in a large region. == Canada == The Dominion Land Survey of Western Canada took its origin at the First (or Principal) Meridian, located at 97°27′28.41″ west of Greenwich, just west of Winnipeg, Manitoba.
Source: Wikipedia "Principal meridian" · CC BY-SA 4.0
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