Romcal Credits
-
Romcal was written by Kenneth
G. Bath. All of the work, except as noted in below, is his original
work. He can be contacted by Internet e-mail at "kbath@harris.com".
Please send any comments or suggestions.
-
Selected parts of the PostScript® option
of this software are taken or derived from "pscal - a PostScript calendar
generator" written by Christopher Phillips. Mr. Phillips was also very
helpful in the development of the color PostScript options. I have searched
in vain for a web page or FTP site from which to get this program. The
pscal copyright notice follows:
"pscal - a PostScript calendar generator"
"Copyright (C) 1992, Christopher Phillips"
"Permission to use and modify this software and its documentation for
any purpose other than its incorporation into a commercial product is hereby
granted without fee. Permission to copy and distribute this software and
its documentation only for non-commercial use is also granted without fee,
provided, however, that the above copyright notice appear in all copies,
that both that copyright notice and this permission notice appear in supporting
documentation. The author makes no representations about the suitability
of this software for any purpose. It is provided "as is" without express
or implied warranty."
-
The algorithm of the computation of the date of Easter is taken from the
Explanatory
Supplement to the Astronomical Almanac, P. Kenneth Seidlmann, USNO,
ed., p. 582.
-
Thomas McGinnis supplied some
suggestions for options. Thanks also to him for beta testing and doing
some of the research.
-
Bill White has provided some insight into the finer details of the Calendar,
and has found quite a lot of official Church documents.
-
The source code for converting a given day number of a given year to the
month and day is based on an algorithm by Peter Baum described at his
web site.
-
The algorithm for determining the day of the week, given a year, month,
and day, is based upon Zeller's Congruence, published in "Kalender-Formeln"
by Christian Zeller in Acta Mathematica, vol. 9, pp. 131-136 (Nov.,
1886). An excellent discussion of this algorithm, including translations
of Zeller's papers, can be found at
Zeller's Calendrical Works.
-
PostScript® is a registered trademark
of Adobe Systems, Incorporated.
© 2001-2003, Kenneth G. Bath