Newton's Unpublished Calendar

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Newton's Unpublished Calendar

Karl Palmen

Dear Calendar People


I’ve found another website about Isaac Newton’s Calendar, which includes a yerm-like lunar calendar at


This is referenced in the Wikipedia page for Lunar calendar [5].


One new piece of information it provides is two possible start dates for the lunar calendar on 1 January 1700,

Either 2nd day of the 1st month of the 2nd Great cycle or 2nd day of 8th month of the 3rd Great cycle.

If ‘Great cycle’ referred to the 49-month cycle, its number would have no effect on the calendar besides the actual numbering the great cycles.

So I think it may there refer to the yerm like period of 17 or 15 months referred to as the ‘smaller cycle’.


As in earlier articles about this, it gives the reason of non-publication as the absence of a satisfactory tropical year value. He started with 365 days 5 hours 48 minutes 46 seconds, then moved towards 365 days 5 hours 49 minutes.