Grads to Seconds conversion
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The grad is a unit of plane angle that is equivalent to 1⁄400 of a circle. It is also known as gon or grade (not to be confused with gradient or radian unit). One grad equals 9⁄10 of a degree or π⁄200 of a radian.
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.