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.

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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. Public Domain Mark. Source: Wellcome Collection.