radian

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ra·di·an (rad),

(rā'dē-ăn),
A supplementary SI unit of plane angle.
[L. radius, ray]

ra·di·an

(rad) (rā'dē-ăn)
A supplementary SI unit of plane angle.
[L. radius, ray]

radian

(rā′dē-ăn)
1. A unit of angular measurement equivalent to 57.295 degrees. It is subtended at the center of a circle by an arc the length of the radius of the circle.
2. In ophthalmometry, a lens of 1 radian would have one plane surface equal in length to the radius of curvature of the curved surface.
References in periodicals archive ?
But MicroRadian or the town administration did not show any authorization from the Philippine Institute of Volcanology and Seismology (Phivolcs).
The turret is stabilised to four microradians, the inner gimbal in pitch, roll and yaw, the outer azimuth and elevation.
The system itself is comprised of an airborne platform, either manned/unmanned aircraft, medium to high altitude aerostats, long endurance UAVs, or spacecraft, equipped with a stabilized tracking gimbal, accurately locked to 5-10 microradians. The cameras employed are commercial, off-the-shelf 11 Mpx, 12-bit cameras.