Minute and second of arc

A minute of arc is one sixtieth of a degree; a second of arc is one sixtieth of a minute of arc. These units describe small astronomical angles, including astronomical seeing.

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- Arcsecond Minute and second of arc

Arcsecond ( $1^{''} = π /648000 rad$ )

An arcsecond is

1/3600

of a degree, equivalently

π /648000

radians. There are approximately

206265

arcseconds in a radian.

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