Conversion Center

Dekan is a unit of angle measurement equal to 10 deg, or 1/36 circle. This unit was used by ancient Egyptians, which divided the circle of the Zodiac into 36 divisions. These divisions was called by the Greeks as dekans. The unit is still used sometimes in astrology, where one dekan equals 1/3 sign.

Radian (rad) is the SI unit of angle. It is a derived SI unit, defined as m⋅m^-1, which means that angles are dimensionless. One radian is the angle at the center of a circle that cuts off an arc of length equal to the radius. Since the circumference equals 2 π times the radius, one radian equals 1/(2 π) of the circle, or approximately 57.296^o.