Diameter of Earth

The Physics Factbook
Edited by Glenn Elert -- Written by his students
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Bibliographic Entry Result
(w/surrounding text)
Heimler, Neil. Principles of Science. Columbus, OH: Merrill, 1992. "12,756 km" 12,756 km
World Book Encyclopedia. Chicago: World Book. "12,713 km" 12,713 km
"Earth" Encarta. Microsoft, 1996. "12,756.3 km" 12,756.3 km
Earth, Space and Time: An Introduction to Earth Science. New York: Wiley, 1979. "12,752 km" 12,752 km
earth. Infoplease.com. "The equatorial diameter is c.7,926 mi (12,760 km) and the polar diameter 7,900 mi (12,720 km)" 12,760 km
12,720 km

The Earth is the fifth largest planet of the solar system. The reason why earth is in a spherical shape, is because of the gravitational pull. The number that appeared most often in my sources was 12,756 km. There are actually two diameters of Earths: equatorial and polar. One of my sources stated that the equatorial diameter is 40 kilometers wider than the polar diameter. The Earth is not a perfect sphere because of a bulge in the equator. Most of the current knowledge of the Earth has been collected in three methods, through satellites, telescopes and outer space exploration.

Ricardo Martinez -- 1999

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