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The diameter of a sphere is the longest path through the centre from one side to another. In a Jovial planet like Jupiter, Saturn, Uranus or Neptune though, the atmospheres are so thick that people may talk about an 'effective diameter' which includes their atmosphere, because it would be so inaccurate to estimate where the actual surface is, and give the propper diameter.

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Is aperture of a spherical mirror equals to its diameter?

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