If $α$ ,H, and $8$ be the altitude hour angle azimuth and the declination of a circumpolar star at its elongation,in latitude $λ$ , the following relation holds good

- 1
  
  cos H= $\frac{\tan λ}{\tan 8}$
- 2
  
  sin $α = \frac{\sin λ}{\sin 8}$
- 3
  
  sin A = $\frac{\cos 8}{\cos λ}$
- 4
  
  all the above

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