Why does "cal 9 1752" produce incorrect results?

[Tim Wright]

In <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).  

Find a good history book and lookup why it produces the *correct* results.

Tim
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