-;;; cal-mayan.el --- calendar functions for the Mayan calendars.
+;;; cal-mayan.el --- calendar functions for the Mayan calendars
-;; Copyright (C) 1992, 1993 Free Software Foundation, Inc.
+;; Copyright (C) 1992, 1993, 1995, 1997, 2001, 2002, 2003, 2004, 2005,
+;; 2006 Free Software Foundation, Inc.
;; Author: Stewart M. Clamen <clamen@cs.cmu.edu>
;; Edward M. Reingold <reingold@cs.uiuc.edu>
+;; Maintainer: Glenn Morris <rgm@gnu.org>
;; Keywords: calendar
;; Human-Keywords: Mayan calendar, Maya, calendar, diary
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs; see the file COPYING. If not, write to
-;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+;; along with GNU Emacs; see the file COPYING. If not, write to the
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
;;; Commentary:
;; Comments, improvements, and bug reports should be sent to Reingold.
;; Technical details of the Mayan calendrical calculations can be found in
+;; ``Calendrical Calculations: The Millennium Edition'' by Edward M. Reingold
+;; and Nachum Dershowitz, Cambridge University Press (2001), and in
;; ``Calendrical Calculations, Part II: Three Historical Calendars''
;; by E. M. Reingold, N. Dershowitz, and S. M. Clamen,
;; Software--Practice and Experience, Volume 23, Number 4 (April, 1993),
;;; Code:
-(require 'calendar)
+(defvar date)
-(defun mayan-adjusted-mod (m n)
- "Non-negative remainder of M/N with N instead of 0."
- (1+ (mod (1- m) n)))
+(require 'calendar)
-(defconst calendar-mayan-days-before-absolute-zero 1137140
+(defconst calendar-mayan-days-before-absolute-zero 1137142
"Number of days of the Mayan calendar epoch before absolute day 0.
-According to the Goodman-Martinez-Thompson correlation. This correlation is
-not universally accepted, as it still a subject of astro-archeological
-research. Using 1232041 will give you Spinden's correlation; using
-1142840 will give you Hochleitner's correlation.")
+This is the Goodman-Martinez-Thompson correlation used by almost all experts,
+but some use 1137140. Using 1232041 gives you Spinden's correlation; using
+1142840 gives you Hochleitner's correlation.")
(defconst calendar-mayan-haab-at-epoch '(8 . 18)
"Mayan haab date at the epoch.")
365)))
(defun calendar-next-haab-date (haab-date &optional noecho)
- "Move cursor to next instance of Mayan HAAB-DATE.
+ "Move cursor to next instance of Mayan HAAB-DATE.
Echo Mayan date if NOECHO is t."
(interactive (list (calendar-read-mayan-haab-date)))
(calendar-goto-date
(or noecho (calendar-print-mayan-date)))
(defun calendar-previous-haab-date (haab-date &optional noecho)
- "Move cursor to previous instance of Mayan HAAB-DATE.
+ "Move cursor to previous instance of Mayan HAAB-DATE.
Echo Mayan date if NOECHO is t."
(interactive (list (calendar-read-mayan-haab-date)))
(calendar-goto-date
(defun calendar-mayan-tzolkin-from-absolute (date)
"Convert absolute DATE into a Mayan tzolkin date (a pair)."
(let* ((long-count (+ date calendar-mayan-days-before-absolute-zero))
- (day (mayan-adjusted-mod
+ (day (calendar-mod
(+ long-count (car calendar-mayan-tzolkin-at-epoch))
13))
- (name (mayan-adjusted-mod
+ (name (calendar-mod
(+ long-count (cdr calendar-mayan-tzolkin-at-epoch))
20)))
(cons day name)))
260)))
(defun calendar-next-tzolkin-date (tzolkin-date &optional noecho)
- "Move cursor to next instance of Mayan TZOLKIN-DATE.
+ "Move cursor to next instance of Mayan TZOLKIN-DATE.
Echo Mayan date if NOECHO is t."
(interactive (list (calendar-read-mayan-tzolkin-date)))
(calendar-goto-date
(or noecho (calendar-print-mayan-date)))
(defun calendar-previous-tzolkin-date (tzolkin-date &optional noecho)
- "Move cursor to previous instance of Mayan TZOLKIN-DATE.
+ "Move cursor to previous instance of Mayan TZOLKIN-DATE.
Echo Mayan date if NOECHO is t."
(interactive (list (calendar-read-mayan-tzolkin-date)))
(calendar-goto-date
(defun calendar-mayan-tzolkin-haab-on-or-before (tzolkin-date haab-date date)
"Absolute date that is Mayan TZOLKIN-DATE and HAAB-DATE.
Latest such date on or before DATE.
-Returns nil if such a tzolkin-haab combination is impossible."
+Returns nil if such a tzolkin-haab combination is impossible."
(let* ((haab-difference
(calendar-mayan-haab-difference
(calendar-mayan-haab-from-absolute 0)
(haab-day (calendar-read
"Haab kin (0-19): "
'(lambda (x) (and (>= x 0) (< x 20)))))
- (haab-month-list (append calendar-mayan-haab-month-name-array
+ (haab-month-list (append calendar-mayan-haab-month-name-array
(and (< haab-day 5) '("Uayeb"))))
(haab-month (cdr
- (assoc
- (capitalize
- (completing-read "Haab uinal: "
- (mapcar 'list haab-month-list)
- nil t))
- (calendar-make-alist
- haab-month-list 1 'capitalize)))))
+ (assoc-string
+ (completing-read "Haab uinal: "
+ (mapcar 'list haab-month-list)
+ nil t)
+ (calendar-make-alist haab-month-list 1) t))))
(cons haab-day haab-month)))
(defun calendar-read-mayan-tzolkin-date ()
'(lambda (x) (and (> x 0) (< x 14)))))
(tzolkin-name-list (append calendar-mayan-tzolkin-names-array nil))
(tzolkin-name (cdr
- (assoc
- (capitalize
- (completing-read "Tzolkin uinal: "
+ (assoc-string
+ (completing-read "Tzolkin uinal: "
(mapcar 'list tzolkin-name-list)
- nil t))
- (calendar-make-alist
- tzolkin-name-list 1 'capitalize)))))
+ nil t)
+ (calendar-make-alist tzolkin-name-list 1) t))))
(cons tzolkin-count tzolkin-name)))
(defun calendar-next-calendar-round-date
(tzolkin-date haab-date &optional noecho)
- "Move cursor to next instance of Mayan HAAB-DATE TZOKLIN-DATE combination.
+ "Move cursor to next instance of Mayan HAAB-DATE TZOLKIN-DATE combination.
Echo Mayan date if NOECHO is t."
(interactive (list (calendar-read-mayan-tzolkin-date)
(calendar-read-mayan-haab-date)))
(defun calendar-previous-calendar-round-date
(tzolkin-date haab-date &optional noecho)
- "Move to previous instance of Mayan TZOKLIN-DATE HAAB-DATE combination.
+ "Move to previous instance of Mayan TZOLKIN-DATE HAAB-DATE combination.
Echo Mayan date if NOECHO is t."
(interactive (list (calendar-read-mayan-tzolkin-date)
(calendar-read-mayan-haab-date)))
(defun calendar-mayan-date-string (&optional date)
"String of Mayan date of Gregorian DATE.
Defaults to today's date if DATE is not given."
- (let* ((d (calendar-absolute-from-gregorian
+ (let* ((d (calendar-absolute-from-gregorian
(or date (calendar-current-date))))
(tzolkin (calendar-mayan-tzolkin-from-absolute d))
(haab (calendar-mayan-haab-from-absolute d))
(let (lc)
(while (not lc)
(let ((datum
- (calendar-string-to-mayan-long-count
+ (calendar-string-to-mayan-long-count
(read-string "Mayan long count (baktun.katun.tun.uinal.kin): "
(calendar-mayan-long-count-to-string
(calendar-mayan-long-count-from-absolute
(calendar-gregorian-from-absolute
(calendar-absolute-from-mayan-long-count date)))
(or noecho (calendar-print-mayan-date)))
-
+
(defun calendar-mayan-long-count-common-era (lc)
"T if long count represents date in the Common Era."
(let ((base (calendar-mayan-long-count-from-absolute 1)))
(provide 'cal-mayan)
+;;; arch-tag: 54f35144-cd0f-4873-935a-a60129de07df
;;; cal-mayan.el ends here