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 c22.26

c22.26

Columns 2 and 3 of this table are extracted from the Nautical Almanac for 1909. Column 4, Moon's elongation, is of course column 2 less column 3, and the difference between the elongations of two successive days is entered in column 5. The tithi we want is Bahula Shashṭhi, i.e., the 21st tithi which ends when the Moon's elongation is 21 × 12° = 252°. This, we find, was sometime before Greenwich noon on 5 September 1909. Since the Moon's exact elongation at Greenwich noon on 5th September 1909 was 253° 9' 46.3" which is 1° 9' 46.3" (= 1.1628°, by Table XIX) more than we require, we have to deduct the time taken by the Moon to effect this elongation. This last time may be determined by working out a proportion either to the elongation of the previous 24 hours (12° 12' 26.1" = 12.2072° by Table XIX) or to the elongation of the next 24 hours (12° 48' 4.5" = 12.8011° by Table XIX). The result is (1) 1.1628/12.2072 = 0953 day, or (2) 1.1628/12.8011 = 0908 day.