If h is the altitude of the star $ϕ$ is the observer's latitude, and $δ$ is the star's declination, the value of azimuth is given by

- 1
  
  $\cos Z = (\sin δ - \sin ϕ . \sin h) / (\cos ϕ \cos h)$
- 2
  
  $\cos Z = (\cos δ - \sin ϕ . \sin h) / (\sin ϕ \cos h)$
- 3
  
  $\cos Z = (\tan δ - \sin ϕ . \sin h) / (\sin ϕ \cos h)$
- 4
  
  none of the above

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