Since life on earth is affected significantly by the movements of Sun and Moon, the calendar has to be based on both their positions relative to earth. The cale

Since life on earth is affected significantly by the movements of Sun and Moon, the calendar has to be based on both their positions relative to earth. The calendar system invented in ancient India does this. Check out this illustration in the wikipedia page on Hindu Calendar for a quick understanding. https://en.wikipedia.org/wiki/File:Hindu_Lunisolar_Calendar.ogv https://en.wikipedia.org/wiki/File:Hindu_Lunisolar_Calendar....