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 c15.13

Now, the sidereal longitude corresponding to any day of the solar year is found from Tables XVII-A and XVII-C (Tables, p. 207 208) thus :—