The datum is defined by the observed heights of mean sea level at the 26 tide gauges and by the set of elevations of all bench marks resulting from the adjustment. A total of 106,724 kilometers of leveling was involved, constituting 246 closed circuits and 25 circuits at sea level.
George Washingtonâs Mount Vernon is located roughly 15 miles south of Washington, D.C. and 8 miles south of Alexandria, Virginia on the banks of the Potomac River, at the southern end of the George Washington Memorial Parkway.
Distance from Washington, D.C. to Toronto. Distance from Washington, D.C. to Toronto is 568 kilometers. This air travel distance is equal to 353 miles. The air travel (bird fly) shortest distance between Washington, D.C. and Toronto is 568 km= 353 miles. If you travel with an airplane (which has average speed of 560 miles) from Washington, D.C. to Toronto, It takes 0.63 hours to arrive.