Use the below online Second of arc to Radian converter to convert an angle second of arc to radian:

Radian is a unit of measurement of an angle. Radian of one circle is the length of circumference divided by the radius or 2πr/r or 2π. Therefore a full circle has 2π radians which is equal to 360 degrees. Thus one radian is equal to 180/π degrees.

## Second of arc

A Second of arc or arcsecond is a unit of measurement of an angle which is equal to 1/60 of an arcminute or 1/3600 of a degree or π/648000 of a radian. The standard symbol for the arcsecond is the double prime(“) or double quote. Thus One arcsecond is written as 1”. It is also abbreviated as arcsec or asec.

## How to convert second of arc to radian

A Second of arc = 1/3600 degree
Then, 1° = 3600 arcsec
A full circle (360°) = 2π radians
Therefore, 3600 arcsec = 2π/360 radians
Then, 1 arcsec = (2π/360)/3600 = 0.000004 radians
Thus 1 arcsec = 0.000004 rad

### Example 1:

Convert 15 second of arc to radian
Therefore, 15 arcsec = 15 * 0.000004 = 0.00006 rad

### Example 2:

Convert 50 second of arc to radian
Therefore, 50 arcsec = 50 * 0.000004 = 0.0002 rad

00
10.000004
20.000008
30.000012
40.000016
50.00002
60.000024
70.000028
80.000032
90.000036
100.00004
110.000044
120.000048
130.000052
140.0042
150.000056
200.00008
500.0002
1000.0004