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Arc Second

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 quantities 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)

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