Your Antares example:
I get:
Hc: 7*32.1' - Ho: 7* 14.1' = Away 18.0 nm
Thats what I come up with using the Hc formula that was used to compile HO 229
Hc = arcsin [(sin L sin d) + (cos L cos d cos LHA)]
Z = [(sin d - sin L sin Hc) / (cos L cos Hc)]
Z = 145*, then Zn = 360* - Z = 215*
Legend:
L = Latitude
d = Declination
LHA = Local Hour Angle
Z = Azimuth Angle (measured E & W from 0-180*)
Zn = Azimuth (measured 0-360*)
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