Position angle a hypothetical binary star with a PA of 135 degrees, that means an imaginary line in the eyepiece drawn from the north celestial pole to the primary (P) would be offset from the secondary (S) such that the NCP-P-S angle would be 135 degrees. When graphing visual binary orbits, the NCP line is traditionally drawn downward—that is, with north at bottom—and PA is measured counterclockwise. Also the direction of the proper motion can for example be given by its position angle. The definition of position angle is also applied to extended objects like galaxies, where it refers to the angle
Angle deception jamming angles. This pattern is typically represented by measuring the angle where it has one-half the sensitivity as it does on the boresight. This is known as the half power point. This means that a target in a radar beam will return a signal when the antenna is anywhere within a few degrees of the boresight. The pattern is too wide to allow the radar to directly guide weapons, especially anti-aircraft artillery which need accuracy on the order of 0.1 degrees. However, it is possible to use the non-linear pattern to improve the angle measurement using a system known as conical