Hebrew calendar (astronomically called a lunar conjunction and, in Hebrew, a molad) is the moment at which the sun and moon are aligned horizontally with respect to a north-south line (technically, they have the same ecliptical longitude). The period between two new moons is a synodic month. The actual length of a synodic month varies from about 29 days 6 hours and 30 minutes (29.27 days) to about 29 days and 20 hours (29.83 days), a variation range of about 13 hours and 30 minutes. Accordingly, for convenience, a long-term average length, identical to the mean synodic month of ancient times (also
Meṣa in the Tamil calendar, and is its first month. The ancient and medieval era Sanskrit texts of India vary in their calculations about the duration of Mesha, just like they do with other months. For example, the "Surya Siddhanta" calculates the duration of Mesha to be 30 days, 22 hours, 26 minutes and 48 seconds. In contrast, the "Arya Siddhanta" calculates the duration of Mesha to be 30 days 22 hours 12 minutes. Mesha is also an astrological sign in Indian horoscope systems, corresponding to Aries. Meṣa Meṣa, or Mesha (मेष), is a month in Indian solar calendar. It corresponds