How many radian in 1 arcsecond?
The answer is 4.8481368111E-6.

We assume you are converting between **radian** and **arcsecond**.

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radian or
arcsecond

The SI derived unit for **angle** is the radian.

1 radian is equal to 206264.806247 arcsecond.

Note that rounding errors may occur, so always check the results.

Use this page to learn how to convert between radians and arcseconds.

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In mathematics and physics, the radian is a unit of angle measure. It is the SI derived unit of angle. It is defined as the angle subtended at the center of a circle by an arc of circumference equal in length to the radius of the circle. Angle measures in radians are often given without any explicit unit. When a unit is given, sometimes the abbreviation rad is used, sometimes the symbol c (for "circular").

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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