\b[<Astronomical seeing> is the atmospheric angular blurring of a point-source image, usually reported in <arcseconds>.] Operationally it is commonly characterized by the <full width at half maximum> of a long-exposure stellar <point spread function>. The full observed width can also contain telescope and instrumental contributions; the atmospheric seeing is the turbulence contribution.

Solution

Past exam of the mathematics course of the University of Cambridge / 2019 / iii / Paper 338 / 2 / a / v / Solution

{title2=$1''=\pi/648000\ \mathrm{rad}$}

An arcsecond is $1/3600$ of a degree, equivalently $\pi/648000$ radians. There are approximately $206265$ arcseconds in a radian.


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 Incoming links: Arcsecond