Given that H 1, H 2 are the hour angles of a star of declination δ on the prime vertical west and at setting respectively for an observer in north latitude, show that cos H 1 cos H 2+ tan 2 δ = 0.

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Given that H 1, H 2 are the hour angles of a star of declination δ on the prime vertical west and at setting
respectively for an observer in north latitude, show that
cos H 1 cos H 2+ tan 2 δ = 0.

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