;;; solar.el --- calendar functions for solar events
;; Copyright (C) 1992, 1993, 1995, 1997, 2001, 2002, 2003, 2004, 2005,
-;; 2006, 2007, 2008 Free Software Foundation, Inc.
+;; 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
;; Author: Edward M. Reingold <reingold@cs.uiuc.edu>
;; Denis B. Roegel <Denis.Roegel@loria.fr>
;; Maintainer: Glenn Morris <rgm@gnu.org>
;; Keywords: calendar
;; Human-Keywords: sunrise, sunset, equinox, solstice, calendar, diary, holidays
+;; Package: calendar
;; This file is part of GNU Emacs.
-;; GNU Emacs is free software; you can redistribute it and/or modify
+;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
-;; the Free Software Foundation; either version 3, or (at your option)
-;; any later version.
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; 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, Inc., 51 Franklin Street, Fifth Floor,
-;; Boston, MA 02110-1301, USA.
+;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
:type 'number
:group 'calendar)
-;;; End of user options.
-
-
-(defconst solar-n-hemi-seasons
+(defcustom solar-n-hemi-seasons
'("Vernal Equinox" "Summer Solstice" "Autumnal Equinox" "Winter Solstice")
- "List of season changes for the northern hemisphere.")
+ "List of season changes for the northern hemisphere."
+ :type '(list
+ (string :tag "Vernal Equinox")
+ (string :tag "Summer Solstice")
+ (string :tag "Autumnal Equinox")
+ (string :tag "Winter Solstice"))
+ :group 'calendar)
-(defconst solar-s-hemi-seasons
+(defcustom solar-s-hemi-seasons
'("Autumnal Equinox" "Winter Solstice" "Vernal Equinox" "Summer Solstice")
- "List of season changes for the southern hemisphere.")
+ "List of season changes for the southern hemisphere."
+ :type '(list
+ (string :tag "Autumnal Equinox")
+ (string :tag "Winter Solstice")
+ (string :tag "Vernal Equinox")
+ (string :tag "Summer Solstice"))
+ :group 'calendar)
+
+;;; End of user options.
(defvar solar-sidereal-time-greenwich-midnight nil
"Sidereal time at Greenwich at midnight (universal time).")
(and set-time (calendar-date-equal date (car adj-set)) (cdr adj-set))
(solar-daylight length))))
-(defun solar-sunrise-sunset-string (date)
- "String of *local* times of sunrise, sunset, and daylight on Gregorian DATE."
+(defun solar-sunrise-sunset-string (date &optional nolocation)
+ "String of *local* times of sunrise, sunset, and daylight on Gregorian DATE.
+Optional NOLOCATION non-nil means do not print the location."
(let ((l (solar-sunrise-sunset date)))
(format
- "%s, %s at %s (%s hours daylight)"
+ "%s, %s%s (%s hours daylight)"
(if (car l)
(concat "Sunrise " (apply 'solar-time-string (car l)))
"No sunrise")
(if (cadr l)
(concat "sunset " (apply 'solar-time-string (cadr l)))
"no sunset")
- (eval calendar-location-name)
+ (if nolocation ""
+ (format " at %s" (eval calendar-location-name)))
(nth 2 l))))
(defconst solar-data-list
(sin (mod
(+ (cadr x)
(* (nth 2 x) U))
- (* 2 pi)))))
+ (* 2 float-pi)))))
solar-data-list)))))
(aberration
(* 0.0000001 (- (* 17 (cos (+ 3.10 (* 62830.14 U)))) 973)))
- (A1 (mod (+ 2.18 (* U (+ -3375.70 (* 0.36 U)))) (* 2 pi)))
- (A2 (mod (+ 3.51 (* U (+ 125666.39 (* 0.10 U)))) (* 2 pi)))
+ (A1 (mod (+ 2.18 (* U (+ -3375.70 (* 0.36 U)))) (* 2 float-pi)))
+ (A2 (mod (+ 3.51 (* U (+ 125666.39 (* 0.10 U)))) (* 2 float-pi)))
(nutation (* -0.0000001 (+ (* 834 (sin A1)) (* 64 (sin A2))))))
(mod (radians-to-degrees (+ longitude aberration nutation)) 360.0)))
contents of temp window."))))))
;;;###cal-autoload
-(defun calendar-sunrise-sunset ()
+(defun calendar-sunrise-sunset (&optional event)
"Local time of sunrise and sunset for date under cursor.
Accurate to a few seconds."
- (interactive)
+ (interactive (list last-nonmenu-event))
(or (and calendar-latitude calendar-longitude calendar-time-zone)
(solar-setup))
- (let ((date (calendar-cursor-to-date t)))
+ (let ((date (calendar-cursor-to-date t event)))
(message "%s: %s"
(calendar-date-string date t t)
(solar-sunrise-sunset-string date))))
+;;;###cal-autoload
+(defun calendar-sunrise-sunset-month (&optional event)
+ "Local time of sunrise and sunset for month under cursor or at EVENT."
+ (interactive (list last-nonmenu-event))
+ (or (and calendar-latitude calendar-longitude calendar-time-zone)
+ (solar-setup))
+ (let* ((date (calendar-cursor-to-date t event))
+ (month (car date))
+ (year (nth 2 date))
+ (last (calendar-last-day-of-month month year))
+ (title (format "Sunrise/sunset times for %s %d at %s"
+ (calendar-month-name month) year
+ (eval calendar-location-name))))
+ (calendar-in-read-only-buffer solar-sunrises-buffer
+ (calendar-set-mode-line title)
+ (insert title ":\n\n")
+ (dotimes (i last)
+ (setq date (list month (1+ i) year))
+ (insert (format "%s %2d: " (calendar-month-name month t) (1+ i))
+ (solar-sunrise-sunset-string date t) "\n")))))
+
(defvar date)
;; To be called from diary-list-sexp-entries, where DATE is bound.