| Small-angle Formula |
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Information AboutSmall-angle Formula |
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The small-angle formula is a Mathematical approximation, used in Astronomy . It relates the linear size (''D'') of an object to its Angular size (α) and its distance from the observer (''d'') and is a valid approximation if α is small. The approximate formula is: D Here, α has to be measured in Arcsecond s. The number 206,265 is approximately equal to the number of Arcsecond s in a Circle (1,296,000), divided by 2π . The exact formula is D and the above approximation follows from this because tan(''x'') is approximately equal to ''x'' if ''x'' is small. |
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