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# Chief Mate Exam oral questions and answers by Capt P K Chattopadhyay

## Q. 3) What is harmonic constant.

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O1, K1, M2, S2 in the tidal calculation by the harmonic method are the harmonic constant. its constant for a port. the constant is based on a measurement by say a stick or something, whose actual depth is known. then the height of tide is calculated according to that height.