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
David Van Gelder Octagon House David Van Gelder Octagon House The David Van Gelder Octagon House, also known as Springside is located at 21 Walnut Street in Catskill, New York. The brick house was built in 1860. It is architecturally significant as an example of an octagon house. The eight-sided plan was made popular in the mid-19th century by phrenologist Orson Squire Fowler. He called the floor plan "a superior plan". It includes four large square rooms and four small triangular rooms on each of the two floors. Two corners of each of the triangular rooms are small triangular closets. A central stair rises through