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 gauge needs to know the limiting distance for a tree. The PRF using a 10 BAF angle gauge is for every inch of tree diameter. Therefore, 20 inches × 2.75 ft/inch = . This means that a tree must be over away from the center of the plot using a BAF 10 angle gauge to be out of the plot. Angle gauge An angle gauge is a tool used by foresters to determine which trees to measure when using a variable radius plot design in forest inventory. Using this tool a forester can quickly measure the trees that are in or