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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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