Diameter of Earth
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| Bibliographic Entry | Result (w/surrounding text) |
Standardized Result |
|---|---|---|
| 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