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Calculate angle of 1 second of arc....

Calculate angle of 1 second of arc.

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1 second of arc `=1"=(1^(@))/(60xx60)`
`=1/(60xx60)xx (pi)/180=(1/3600xx3.14/180) [ :' 1^(@)=(pi)/180]`
1 second of arc `=4.85xx10^(-6)` rad.
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