If $δ$ is the declination of the star and $ϕ$ is the latitude of the observer then the hour angle of the star at elongation is given by

- 1
  
  $\sin H = \tan ϕ . c o t δ$
- 2
  
  $\cos H = \tan ϕ . c o t δ$
- 3
  
  $\tan H = \tan ϕ . c o t δ$
- 4
  
  none of these

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