**Full name:** arcsecond

**Plural form:** arcseconds

**Symbol:** sec

**Category type:** angle

**Scale factor:** 4.8481368111E-6

The SI derived unit for angle is the radian.

1 radian is equal to 206264.806247 arcseconds.

Valid units must be of the **angle** type.

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A second of arc or arcsecond is a unit of angular measurement which comprises one-sixtieth of an arcminute, or 1/3600 of a degree of arc or 1/1296000 (approximately 7.7×10-7) of a circle. It is the angular diameter of an object of 1 unit diameter at a distance of 360×60×60/(2pi) (approximately 206,265 units), such as (approximately) 1 cm at 2.1 km, or, directly from the definition, 1 astronomical unit at 1 parsec.

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