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
Williams and Stancliff Octagon Houses Williams and Stancliff Octagon Houses The Joseph Williams Octagon House and the Gilbert Stancliff Octagon House are once-identical historic mid-1850s octagon houses located next to each other at 26 and 28 Marlborough Street in Portland, Connecticut. Constructed of Portland brownstone in the 1850s, they are distinctive as the only known pair of little-altered octagon houses in the state. The pair of houses, also known as the Octagon House Pair, was added to the National Register of Historic Places in 1976. The two octagon houses are located just outside the town center of Portland, on the north side of Marlborough Street.