Before revision: Center = geographical position of the body: (B, L) = (Dec, GHA) Radius = zenith distance: zd [nm] = 60 * (90 - Ho) Equation The equation links the following variablesVector equation of the Circle of Position The position of the observer: B, L. The coordinates of the observed star, its geographical position: GHA, Dec.
After revision: Center = geographical position of the body: (B, L) = (Dec, GHA) Radius = zenith distance: zd [nm] = 60 ⋅ (90 - Ho) Equation The equation links the following variablesVector equation of the Circle of Position The position of the observer: B, L. The coordinates of the observed star, its geographical position: GHA, Dec.