Two students are located 800 kilometers apart on the same meridian of longitude. They measure the altitude of the Sun at noon on the same day. They can use these measurements to calculate Earth's circumference.
<h3>How far does the Earth actually go around?</h3>
The equatorial diameter measures 7930 miles, which is a little more than the distance between the north and south poles, which is roughly 7900 miles. The Earth's circumference is simply equal to its average diameter, 7915 miles, multiplied by pi, where pi is 3.14159. This gives us an estimate of 25,000 miles for the circumference of the Earth.
The circumference and radius of the Earth, which have since been determined by orbiting satellites, are both quite near to the recognised contemporary estimates of 40,070 km and 6378 km, respectively. Since a circle's diameter is equal to twice its radius, the diameter of the Earth is 12,756 kilometres.
The circumference of the Earth depends on how it is measured. When it is measured around the equator, it is 40,075 km (approximately, 24,901 miles), whereas, if it measured from the north pole to the south pole it is 40,008 km (approximately, 24,860 miles).
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