Why does the website at the end of Nicholas's message below calculate 
that today (January 28, 2009) is a Tuesday?

Jim Eaton


-----Original Message-----
From: Nicholas J. Theocarakis

BTW, the algorithm for converting Julian to Gregorian dates is more
complicated than subtracting or adding 13 or 11 days.  For example,
in Smith's time the difference was 11 days wheras in Keynes' time the
difference was 12 days.  "The Great October Socialist Revolution" was
of course celebrated, as Barkley Rosser points out, on Nov 7.  (13
days difference).  A very useful site for this conversion is that of
the Institut de mecanique celeste et de calcul des ephemerides (in english).
http://www.imcce.fr/page.php?nav=en/ephemerides/astronomie/calendriers/correspond/cal429.php