Remarks upon the solar and the lunar years, the cycle of 19 years, commonly called the golden number, the epact, and a method of finding the time of Easter, as it is now observed in most parts of Europe / Being part of a letter from the Right Honourable George Earl of Macclesfield to Martin Folkes, President of the Royal Society, and by him communicated to the same, May 10 1750.

  • Macclesfield, George Parker, Earl of, approximately 1697-1764.
Date:
1751
Catalogue details

Licence: Public Domain Mark

Credit: Remarks upon the solar and the lunar years, the cycle of 19 years, commonly called the golden number, the epact, and a method of finding the time of Easter, as it is now observed in most parts of Europe / Being part of a letter from the Right Honourable George Earl of Macclesfield to Martin Folkes, President of the Royal Society, and by him communicated to the same, May 10 1750. Source: Wellcome Collection.

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    [7 ] Gregorians, than the increafmg one of them by 12 inhead of 11. -For, in every Gregorian Solar Year, whofe Date confifts of any Number of entire Hun¬ dreds not divifible* by 4, it is ftippofed that the Equ'N nox has anticipated one whole Day; and therefore one Day, that which ought to be the intercalary one, .is omittqd; anfd confcquently t4ie preceding Solar Year, where- one Day was loft, exceeded the Lunar Year by 16 Days only inftead of 11. In order therefore to adapt the before-mention'd Rule to the Gregorian Account, and to know in what Years the-Epads fhould either be extraordinariy augmented or diminished, and the Golden Numbers fhould either be fet backwards or forwards in the Calendar; the following Rule's and Dire&ions muft beobferved. • Firft. That in the Years 1800, 2100, 2700, 3000, &c. where the Number'of entire Hundreds is divifi- ble by 3, but not by 4, the Gregorian Solar, as well as the Lunar Year, wiU have loft a Day j and coiife- quently the Difference betwixt them will be the fame as ufual: Therefore in thofe Years there muft be no Alteration, cither in the Epacts or the Golden Numbers j but the former muft go on in the fame manner, and the latter ftand prefixed to the fame Days in the Calendar, for another, as they did for the laft hundred Years. ‘ 2'dly. The like will happen inthcYcars 2000, 2800, 3 200, &c. where the Number of entire Hundreds is divifible by 4, but not by 3 : For neither the Gre¬ gorian Solar nor the Lunar Year is to be altered; and therefore the- Epafts muft go on, and the Golden Numbers ftand, as 'they did before. ; ' -ivV . But,