Earth's rotation causes different latitudes to travel at different speeds (like a spinning basketball is faster at it's equator and slower at it's poles). Below calculates the subtle speed difference between two points based on their north-south distance (the point closer to equator will have higher speed). Select an approximate latitude, and enter the north-south distance (in feet) to get the speed difference between those two points.

	Latitude	Latitude Lookup	Distance (feet)		Speed Difference		Time (hours)		Total Distance
		<< Manual EntryAnchorageAtlantaBostonChicagoDenverDubaiHonoluluHoustonIndianapolisLas VegasLondonLos AngelesMiamiMoscowMumbaiNashvilleNew YorkParisPhiladelphiaPhoenixPortlandSacramentoSeattleSydneyTokyoToronto		=		✕		=

Examples

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39.73915° 0.25 feet (3 inches) = 0.503 in/hr

3-inch shower drain in Denver has a speed difference of ½ inch-per-hour between the north and south sides of drain

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25.77427° 500 feet = 57.074 ft/hr

500-foot long factory in Miami is moving 57 feet-per-hour (11.4 inches-per-minute) faster on the southern end of the building

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41.85003° 6 feet = 12.611 in/hr ✕ 8 hours = 8.407 feet

6-foot Chicago person lying with head pointing north for 8-hours; their feet (nearest equator) traveled 8.4-feet further than their head

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enter the north-south distance (in feet) to get difference in speed (faster rotation speed minus the slower rotation speed) optionally enter a time duration (in hours) to get distance the faster end-point moved more than the slower end-point