Before revision: Navigation Nº.116 Vol.XXIX, Institut français de navigation, octubre/1981.curve for a star with coordinates (Dec, Gha), -Declination and Greenwich Hour Angle- , observed under an azimuth Z is given by: where lha is the local hour angle, and all points with latitude B and longitude L, they define the curve.
After revision: Navigation Nº.116 Vol.XXIX, Institut français de navigation, octubre/1981.curve for a star with coordinates (Dec, Gha), - Declination and Greenwich hour angle - , observed under an azimuth Z is given by: where LHA is the local hour angle, and all points with latitude B and longitude L, they define the curve.