Oblate spheroid - Simple English Wikipedia, the free encyclopedia
An oblate spheroid is a very famous shape. It is the shape of the Earth and some other planets. It is like a sphere squashed from the top so the circumference around the poles is less than the circumference around the equator .
Spheroid - Wikipedia
The oblate spheroid is the approximate shape of rotating planets and other celestial bodies, including Earth, Saturn, Jupiter, and the quickly spinning star Altair. Saturn is the most oblate planet in the Solar System , with a flattening of 0.09796.
Oblate Spheroid -- from Wolfram MathWorld
2024年11月7日 · An oblate spheroid is a "squashed" spheroid for which the equatorial radius a is greater than the polar radius c, so a>c (called an oblate ellipsoid by Tietze 1965, p. 27). An oblate spheroid is a surface of revolution obtained by rotating an ellipse about its minor axis (Hilbert and Cohn-Vossen 1999, p. 10).
Strange but True: Earth Is Not Round | Scientific American
2007年4月12日 · Isaac Newton first proposed that Earth was not perfectly round. Instead, he suggested it was an oblate spheroid—a sphere that is squashed at its poles and swollen at the equator. He was correct...
Spheroid -- from Wolfram MathWorld
2024年11月7日 · A spheroid is an ellipsoid having two axes of equal length, making it a surface of revolution. By convention, the two distinct axis lengths are denoted a and c, and the spheroid is oriented so that its axis of rotational symmetric is along the z-axis, giving it the parametric representation x = asinvcosu (1) y = asinvsinu (2) z = ccosv, (3 ...
Figure of the Earth - Wikipedia
The oblate spheroid, or oblate ellipsoid, is an ellipsoid of revolution obtained by rotating an ellipse about its shorter axis. It is the regular geometric shape that most nearly approximates the shape of the Earth. A spheroid describing the figure of the Earth or other celestial body is called a reference ellipsoid.
Earth ellipsoid - Wikipedia
An Earth ellipsoid or Earth spheroid is a mathematical figure approximating the Earth's form, used as a reference frame for computations in geodesy, astronomy, and the geosciences. Various different ellipsoids have been used as approximations.
Oblate Spheroids - an overview | ScienceDirect Topics
The Earth is an oblate spheroid. It is composed of three main successive overlying layers in spherical shells. The individual layer and sublayers vary in the physical state of solid, fluid, and gaseous form, dissimilar composition, and contrast density.
Oblate spheroid | geometry | Britannica
…conceive of Earth as an oblate spheroid. In one of the many brilliant analyses in his Principia, published in 1687, Newton deduced Earth’s shape theoretically and found that the equatorial semiaxis would be 1 / 230 longer than the polar semiaxis (true value about 1 / 300). Read More
What Is an Oblate Spheroid? - AllTheScience
2024年5月21日 · An oblate spheroid is a three dimensional solid and is most easily described as a sphere that has been compressed from top to bottom, causing the equator to bulge out. The Earth, and most rotating bodies in space are shaped like this.