| http://www.w3.org/ns/prov#value | - By substituting the DA =5* (1+SIN (2*??*Xa/600-??/2))ti Xa=30??n+10to the expression (1) for DA, the value of n can be calculated from the DA as follows. n=(10/??)??(??a +(??/2))-(1/3) (90) ??a =sin-1 ((DA /5)-1) One of two values of ??a existing between 0 and 2?? is selected based on the condition that n is an integer.
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