Indian Chronology (Solar, Lunar and Planetary): A Practical Guide to the Interpretation and Verification of Tithis, Nakshatras, Horoscopes and other Indian Time-records, B.C. 1 to A.D. 2000 c32.23

c32.23

240. In ordinary years, the week-day of the 1st of January is the co-efficient of the year. Thus the co-efficient of the year A.D. 1910 is 7 or 0, and the week-day of 1st January A.D. 1910 is also 7 or 0, *i.e.*, Sunday. The reason is that in ordinary years, the week-day of 1st January is the co-efficient of the year *plus* 6 + 1; and the addition of 7, *i.e.*, of a whole week, does not of course change the week-day.