Chapter 9
Law 1
In regard the length of the solar year: there are Jewish sages that say that it is three hundred sixty five days and a quarter of a day, which is six hours. There are among them that say that it is less than a quoter of a day. Likewise, among the scholars of Greece and Persia there is a disagreement about this matter.
Law 2
Those that say that it is 365 days and a quarter of a day, remainder of each nineteen-year cycle is one hour and four hundred eighty five parts, as we said. Then, from season to season there is ninety one day and seven and a half hours. And once you know one season - in which day and in which hour it is - start counting to the second season that is after it, and from the second to the third - until the end of the world.
Law 3
Season of Nisan is the hour and the part when the sun enters enters into the beginning of the constellation of Aries. And season of Tammuz is when the sun is at the start of the constellation of Cancer. And the season of Tishrei is when the sun is at the start of the constellation of Libra. And the season of Tevet is when the sun is at the start of the constellation of Capricorn. And the season of Nisan in the first year of Creation - according to this calculation = opinion - preceded the new moon of Nisan by seven days nine hours and six hundred and forty two part, in symbols - 7 9 642.
Law 4
This is the way to calculate the season. First, figure out how many complete cycles are there from the year of the Creation till the cycle that you want. And take, for each of those cycles, one hour and 485 parts. Gather all the parts into hours, and all the hours into days, and subtract from the total seven days nine hours and six hundred and forty two parts, and what remains - add it to the new moon of Nisan of the first year of the cycle. You get in which hour and in which day of the month will be the season of Nisan of that first year of that cycle. And from it, start counting ninety one day and seven and a half hours for each subsequent season.
And if you’d want to know the season of Nisan of the a year that is year number so-and-so of the cycle you are in, take for all the full cycles an hour and 485 for each cycle, and for all complete years that passed in the cycle, ten days and twenty one hours and two hundred and four parts for each year, and add everything up, and subtract from it seven days and nine hours and six hundred and forty two parts. And what remains, remove from it lunar months of twenty nine days and twelve hours and seven hundred ninety-three parts. And remainder less than a lunar month - add it to the new moon of Nisan of that year, and you’ll know the time of the season of Nisan of that year, what day of the month is it and at what hour.
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Law 5
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Law 6
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Law 7
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Law 8
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