Page "Full moon cycle" Paragraph 37

Instead of working with full polynomials, we can use a linear approximation.

And instead of computing with decimals, we approximate the lunation length by a vulgar fraction.

Moreover it is sufficient to keep track of just the numerator by adding once every lunation, an integer constant to a variable that is called the accumulator.

This is similar to calculating the molad in the Hebrew calendar.

It works as follows: