If Œ± is the observed altitude, the refraction correction in seconds – McqOptions

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1.	If Œ± is the observed altitude, the refraction correction in seconds, is
A.	58" cot Œ±
B.	58" tan Œ±
C.	58 sin Œ±
D.	58 cos Œ±.
Answer» B. 58" tan Œ±

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