From: Josef 'Jupp' Schugt <jupp@...>
Date: 2006-12-24T05:50:29+09:00
Subject: Newton's birthday  (Was: [OT] Bible update?) ...)

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* Christian Neukirchen, 12/23/2006 04:01 PM:
> What about Gravmass?  http://www.stallman.org/grav-mass.html

Sir Isaak Newton, Fellow of the Royal Society was born on the 25th of
december 1642 in Woolsthorpe-by-Colsterworth in Lincolnshire, East
Midlands, England where at that time the Julian calendar was still in
effect. This means that the correct day to celebrate his birthday is
 the 4th of january.

When using several frames of reference please make sure that the
appropriate transformation is applied. In this one the two frames of
reference differ by a time offset.

It is obvious that the term "birthday" has little to do with the
recurrence if a calendaric date but applies to an integral number of
years having passed by since the person was born. Otherwise somebody
born on the 29th of february 1980 would celebrate his 7th birthday on
the 29th of february 2008 - at a biological age of 28.

Note that Stallman seems to be aware of this problem because he calls
the holiday "Grav-mass". To me it is an allusion to "Inter Gravissimas":

http://www.bluewaterarts.com/calendar/NewInterGravissimas.htm

Jupp


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