To form apparent right ascension for the date of interest add seconds of apparent right ascension to alpha0. The same method is for apparend declination. After all there are four lines. Line 'J1997.5' contains seconds of alpha and delta to be added to alpha0 delta0 to form mean place at J1997.5. The next lines contains secans and tangent of mean delta and reduction quantities a, a', b, b'.
Example begins here.