Before revision: For a precision of 1 minute of arc, a four figure table is URL 4-place Table; PDF; 51kB An example Data: Lat = 34° 10.0′ N (+) Dec = 21° 11.0′ S (−) LHA = 57° 17.0′ Altitude Hc: a = 0.2298 m = 0.0128 n = 0.2157 hav(ZD) = 0.3930 ZD = archav(0.3930) = 77° 39′ Hc = 90° - 77° 39′ = 12° 21′ Azimuth Zn: a = 0.6807 m = 0.1560 n = 0.0358 hav(Z) = 0.7979 Z = archav(0.7979) = 126.6° Because LHA < 180° and Latitude is North: Zn = 360° - Z = 233.4
After revision: For a precision of 1 minute of arc, a four figure table is enough.Natural-Haversine 4-place Table; PDF; 51kB An example Data: Lat = 34° 10.0′ N (+) Dec = 21° 11.0′ S (−) LHA = 57° 17.0′ Altitude Hc: a = 0.2298 m = 0.0128 n = 0.2157 hav(ZD) = 0.3930 ZD = archav(0.3930) = 77° 39′ Hc = 90° - 77° 39′ = 12° 21′ Azimuth Zn: a = 0.6807 m = 0.1560 n = 0.0358 hav(Z) = 0.7979 Z = archav(0.7979) = 126.6° Because LHA < 180° and Latitude is North: Zn = 360° - Z = 233.4