Contributor By JamesP on March 12, 2022 Category(s)World and PlanetsTopic(s)Planet Earth1,670 km/hThe maximum circumference of the Earth (equator) is roughly 40,070 kilometers, according to NASA. A day is approx 24 hours long. Dividing the circumference by the length of the day gives a speed of about 1,670 km/h (1,037 mph).
