Milliseconds to Seconds conversion
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A millisecond of arc is a unit of angular measurement that is equal to 10-3 of one second of arc. It is commonly used in fields that require unit for expressing very small angles, such as astronomy.
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.