How many radian in 1 arcsecond?
The answer is 4.8481368111E-6.
We assume you are converting between radian and arcsecond.
You can view more details on each measurement unit:
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.
Type in your own numbers in the form to convert the units!
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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