Lunar day around the Sun at the same time, the Moon must travel further to return to the same phase. On average, this synodic period lasts 29 days, 12 hours, 44 minutes, and 3 seconds. This is the mean figure since the speed of the Earth–Moon system around the Sun varies slightly during a year due to the eccentricity of its elliptical orbit, variances in orbital velocity, and a number of other periodic and evolving variations about its observed, relative, mean values, which are influenced by the gravitational perturbations of the Sun and other bodies in the Solar System. As a result,
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