Seconds to Radians conversion
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A second of arc is a unit of angular measurement equal to one sixtieth (1⁄60) of one minute of arc. Since one minute of arc is defined as 1⁄21600 of a rotation, one second of arc is 1⁄1296000 of a rotation.
Radian is the standard unit of angular measure that defines the ratio between the length of arc and its radius. Radian is a former SI supplementary unit, but since 1995 when this category was abolished it is considered a SI derived unit.