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 c29.9

191. The mean and actual positions are the same at 0° or 360°, *i.e.*, at perigee and at 180°, *i.e.*, at apogee.