I know that the best possible approximation of the shape of earth is an oblate sphere. But people also call it as geo-spherical shape of the Earth. What is the meaning of geospherical shape? Does this mean that the shape of Earth itself is unique and hence a word geospherical is used to define that shape but for mathematical calculations we use oblate as the closest approximation.

  • $\begingroup$ Welcome. Do you have a link to where that term is used, and a hint to what you're up to ? It is, in appriximation, on oblate spheroid. Whatever approximation to the earth's shape one uses, it totally depends on the use case. That "oblate spheroid" thing is called an ellipsoid. WGS84 datum is a computer friendly representation and approximation to the earth ellipsoid. $\endgroup$ – user20217 May 4 '20 at 10:50
  • $\begingroup$ Thanks. I understand the theory behind earth approxmiating as oblate spheroid. But my que is I heard a renowned speaker saying earths shape is called as geospherical. But I am unable to understand the meaning of this word. Is it correct to say earth's shape is geospherical. PS: I don't have the link right now. $\endgroup$ – Talha May 5 '20 at 19:38
  • $\begingroup$ @Talha I haven't heard the term "geospherical". The description sounds like something that is normally called the "geoid"? $\endgroup$ – Semidiurnal Simon May 6 '20 at 20:23
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    $\begingroup$ The Geosphere is the solid bits of the earth. vocabulary.com/dictionary/geosphere. Sometimes it's just easier to google things. lmgtfy.com/?q=geosphere+definition $\endgroup$ – Software Engineer May 6 '20 at 21:13

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