About the Units
second (″)
An angular measure equal to 1/60 of a minute or 1/3600 of a degree, used for very precise measurements.
radian (rad)
The standard unit of angular measure, defined by the ratio of arc length to radius (approximately 57.2958 degrees).
Common Conversions
- 1 ″ = 0.000004848137 rad
- 206264.8 ″ = 1 rad