The works of that late most excellent philosopher and astronomer, Sir George Wharton, bar. collected into one volume / by John Gadbvry ...

The use of which Table is thus.

SEek in it the number of years from Nabonnassar, which you desire to turn into Julian: Or (when you find them not precisely) the next greater. From which Number so found, deduct the proposed years, and the remainder added too (if the time proposed be before Christ,) or, if after, Substracted from the year of Christ, (which stands on the right hand the Table over against the Number of Egyptian years) leaves the year to be reckon'd before or after Christ, as the Title directeth.

This done, take (in the same part of the Table) the day of the Julian year agreeable to the first of the Month Toth, and then divide the remainder of years (after the first Substraction) by 4, For, if the Quo∣tus, (which must ever be augmented by 1, when ought remaineth after Division, otherwise not at all) be added to that day of the Julian year, you have the Seat of the first Egyptian Month Toth, in the Ju∣lian Calendar. And (the head of the year being found) 'tis quickly seen how the days of the Egyptian Months agree.

For, take but (in the Canon of Egyptian Months) the Elapsed days from the head of the year to the day proposed, and add the Sum to the day of the Month in the Julian year (unto which you have found that the first of Toth agreeth) and you have the day of the Month in the Julian year, according to the Egyp∣tian proposed.

But if the years proposed be from Alexander and following the Egyptian Ordination; then (because there are just 424. years betwixt the Aera of this King's, and that of Nabonnassar) add but 424 years to the

given years from Alexander and with the Sum, as you did with that of the years of Nabonnassar, find out the corresponding of the Julian year: for it will be the same with that which would be found with the years from Alexander.

Lastly, the day of the Julian year thus gotten, you cannot be ignorant of the Gregorian; for, by adding but to the Julian, the difference of days betwixt them for the Century proposed, you have the day in the Gregorian. As for Example—

Theon (in his Commentaries upon the Six Books of Ptolemies Syntax) maketh mention of a Solar Eclipse observed by him at Alexandria, in the 1112. year of Nabonnassar, the 22. day of the Month Pay∣ni, I desire to know what day of the Julian year agrees thereunto.

The next greater Number of years from Nabon∣nassar (for I find not the year proposed exactly) are, by the Table beforegoing, 1204. and the years of Christ answerable, on the right hand, 456 after Christ, to∣gether with May 1.

Therefore I Substract 1112, from 1204, and there remaineth 92 years, which 92 deducted from the found years after Christ, leaveth 364 for the current years after our Saviour.

This done, I divide the first remainder 92, by 4, and the Quotient is 23, and nothing remaining; which added to May 1. gives May 24. for the day unto which the first of Toth agreeth.

Now, seeing that from the Series of the Egyptian Months, 210 days are compleatly elapsed with the Month Pachon, and that the proposed day is the 22. Current of the following Payni, together making 292, I add 292, to May 24. (unto which the first of Toth answereth,) and it produceth March 13. Therefore

the year of Christ, 365. March 13. post Christum, in the Julian year agreeth to the proposed time from Nabonnassar.