On 2017-04-15, Morten Reistad  wrote:

> In article , rickman   wrote:
>
>> On 4/14/2017 9:51 AM, Dennis Lee Bieber wrote:
>>
>>> On Thu, 13 Apr 2017 23:05:42 +0100, Dr J R Stockton
>>>  declaimed the following:
>>>
>>>> In comp.sys.raspberry-pi message >>> x.com>, Tue, 4 Apr 2017 12:23:02, Dennis Lee Bieber
>>>>  posted:
>>>>
>>>>>       365.2422 days to a Tropical (solar) year. 365.2425 for Gregorian
>>>>> (that's why we drop a leap day every four-hundred years). 3
>>>>> ...
>>>>
>>>> No.  We, at least on this side of the Atlantic, drop a quadrennial leap
>>>> day every one hundred years, except every four hundred years.  It is
>>>> thought that the librettist of "The Pirates of Penzance" was expecting
>>>> that 1900-02-29 would fairly soon occur.
>>>
>>>  Please swat me on the head -- I did know that (and if I were
>>> enumerating the leap-day rules rather than looking at fractional years...
>>> leap day in years divisible by 4 except if also divisible by 100 unless it
>>> is divisible by 400...
>>
>> So for your final exam, did we have a leap day in year 2000?  Or is
>> there another layer to the progression?

Not yet.

> And for how long will it work before it, too, goes out of alignment
> by one day.

Maybe we'll need a new rule stating that years divisible by 3200
are not leap years.

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