Molad based on a constant interval cycle that is widely but incorrectly regarded as an approximation of the time in Jerusalem of the mean lunar conjunction. Each "molad" moment occurs exactly 29 days 12 hours 44 minutes and 3+/ seconds (or, equivalently, 29 days 12 hours and 44+/ minutes) after the previous "molad" moment. This interval is numerically exactly the same as the length of the mean synodic month that was published by Ptolemy in the Almagest, who cited Hipparchus as its source. Although in the era of Hipparchus (2nd century BC) this interval was equal to the average time between
Mithuna (month) solar month of Karkaṭa. The Mithuna month is called "Ani" in the Tamil Hindu calendar. The ancient and medieval era Sanskrit texts of India vary in their calculations about the duration of Mithuna, just like they do with other months. For example, the "Surya Siddhanta" calculates the duration of Mithuna to be 31 days, 15 hours, 28 minutes and 24 seconds. In contrast, the "Arya Siddhanta" calculates the duration of the Mithuna month to be 31 days, 14 hours, 34 minutes and 24 seconds. Mithuna is also an astrological sign in Indian horoscope systems, corresponding to Gemini (astrology). Mithuna (month)