“The search for a perpetual calendar, like the search for perpetual motion, has occupied countless hours of the curious mind. The effort to compress a long series of calendars into a simplified table has resulted in many interesting devices.
Accuracy is easily achieved if the compiler does not include years prior to the adoption of the Gregorian Calendar in 1752. Mr. Goold, original patentee of the calendar which is reproduced below, did not make provision for Leap year.
This deficiency may be overcome by adding one to any date in January or February in any year divisible by four, except those divisible by 100 which are common years; if divisible by 400 it is a Leap Year.”
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The 10,000 year view of cryptocurrency