The right ascension of the first star is 126 ° 15´, and the second is –162 ° 30´. Which star climaxes earlier

The right ascension of the first star is 126 ° 15´, and the second is –162 ° 30´. Which star climaxes earlier and by how many hours and minutes?

α1 = 126 ° 15´, α2 = 162 ° 30´, Δ α =?. Δ α = α1- α2 = 162 ° 30´- 126 ° 15´ = 36.25 °. 1 ° right ascension of a star corresponds to 4 min,
then Δ α = 4 minutes * 36.25 ° = 145 minutes = 2 hours 25 minutes. The first star culminates earlier than the second by 2 h 25 min.

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