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Arcsecond
Conversions to other units
1" | 2.778×10^-4° (degrees) | 4.848 μrad (microradians) | π/648000 radians | 3.086×10^-4 grads (unit officially deprecated)
Conversions from other units
1° | 3600" 1 μrad | 0.2063" 1 rad | 206265" 1 grad | 3240"
Physical quantity
plane angle
Common prefix forms
milliarcsecond (mas)
Unit systems
non-SI but accepted for use with SI | recognized for use in astronomy
Basic unit dimensions
[angle]
Corresponding quantity for 1"
Arc length s along the Earth's equator from s = Rθ: | 101.5 feet | 30.92 meters
Arc length s around the Earth at 45° latitude from s = Rcos(45°)θ: | 71.74 feet | 21.87 meters
Rotation count N from N = φ/(2π): | 7.7×10^-7 rot (rotations)
Slope percentage from [slope percentage] = 100% × tan(θ): | 4.848×10^-4 slope% (slope percent)