Radians to Milliseconds conversion
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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.
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.