Why does "cal 9 1752" produce incorrect results?

[Terry Gaetz Astronomy, U. Western Ontario]

In article <fuchs.659748692 at t500m0>, fuchs at it.uka.de (Harald Fuchs) writes:
> Nathan.Torkington at comp.vuw.ac.nz (Nathan Torkington) writes:
> 
>>In article <3313 at ns-mx.uiowa.edu> khenry at umaxc.weeg.uiowa.edu (Ken Henry) writes:
>>>Does anybody know why "cal 9 1752" produce incorrect
>>>results?  It seems to be in the Unix systems I
>>>checked (BSD 4.3, AIX 3.1).  
> 
>>I believe there was a date change sometime, where the civilised world lost
>>a fortnight to allow the 'old calendar' to become the 'new calendar' which
>>would be in sync with the seasons ...
> 
> You seem to think of the Julian -> Gregorian calendar shift, but that
> was 1582 AD.

Pope Gregory issued a papal bull in 1582 ordering that the new calendar be
introduced.  It was adopted immediately by Catholic countries and
principalities, but the Greek church and the Protestant countries refused.
The changeover straggled over several centuries - Romania used the Julian 
calendar until 1919.

In September 1752, England and the American colonies adopted the Gregorian
calendar.  "Cal 9 1752" correctly handles the transition as adopted by
England and the United States.
--
Terry Gaetz   --   gaetz at uwovax.uwo.ca    or    gaetz at uwovax.BITNET