| Position Angle |
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As the example illustrates, if one were observing a hypothetical binary star with a PA of 135 degrees, that means an imaginary line in the Eyepiece drawn from the north celestial pole (NCP) 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, from 0 to 359 degrees. External Links: |
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