There are many books dealing with this specialized subject, but when the Author engaged himself in this work he found from his study and experience that the Conservation Tables in circulation are not very comprehensive and suffered mainly from two shortcomings-inaccuracy and intricacy. This work tries to rectify both. On this topic Author's cyclopedic work of interchanging Gregorian and Hijrah dates from 120 BH to 2010 AH (506 AD to 2571 AD) has already published ...
