The Mayan number system to base 20 has 19 digits which is the number of years in the Metonic cycle within an error of a few hours. It was well known in ancient times and formed the base of Babylonian calendars for centuries. It could easily be adopted as a lunar calendar to correct the Gregorian calendar’s error. There are not 6 months in a year.
The famous French scientist Laplace shares the foundation of tidal theory with Isaac Newton. Respect is also due to Pythagoras for the harmonic methods later implemented by Lord Kelvin, who described the principle as follows: ‘The expression for the actions of the Sun and Moon can be developed in a convergent series of similar cosines by the principle of small oscillations added