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40° 30741.788505102636 km 30741.788505311282 km 19102.061775 miles 16599.23785 nautical miles 41° 30288.666641065856 km 30288.666641280026 km 18820.50490 miles 16354.57162 nautical miles 42° 29826.274170739110 km 29826.274170958526 km 18533 Earth circumference at 40 degrees latitude.18754 miles 16104.89966 nautical milesFor example, at Columbus (Latitude 40-degrees North): Circumference of the Earth at 40-deg North = 30,600 kilometers Time to complete one Rotation = 24 hours Earth circumference at 40 degrees latitude. Speed of Rotation at 40 North = Distance/Time = 30,600 km / 24 hr = 1280 km/hr [Note: For the more mathematically inclined, the rotation speed at a given Latitude = cos(Latitude) x 1670 km/hr.]If the earth's circumference at the equator is ~40,000km, at what latitude is it's circumference 20,000km? The North pole centred FE map would indicate that this would occur at 45 degrees, the bipolar FE map does not allow for a circumference measurement at the equator, so is useless, and RET would dictate that this circumference would be found.Mathematically, Earth is a spheroid. Earth radius at sea level is 6378.137 km (3963.191 mi) at the equator. It is 6356.752 km (3949.903 mi) at the poles and 6371.001 km (3958.756 mi) on average. The height above sea level of the location is added. Please enter the latitude in decimal degrees, here you can convert coordinates. Earth circumference at 40 degrees latitude.

www.astronomy.ohio-state › Au06 › Unit4 Lecture 21: Rotation & Revolution of the Earth