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Diffstat (limited to 'lisp/calendar/lunar.el')
| -rw-r--r-- | lisp/calendar/lunar.el | 267 |
1 files changed, 0 insertions, 267 deletions
diff --git a/lisp/calendar/lunar.el b/lisp/calendar/lunar.el deleted file mode 100644 index 8c3c07db986..00000000000 --- a/lisp/calendar/lunar.el +++ /dev/null @@ -1,267 +0,0 @@ -;;; lunar.el --- calendar functions for phases of the moon. - -;; Copyright (C) 1992, 1993 Free Software Foundation, Inc. - -;; Author: Edward M. Reingold <reingold@cs.uiuc.edu> -;; Keywords: calendar -;; Human-Keywords: moon, lunar phases, calendar, diary - -;; This file is part of GNU Emacs. - -;; 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 2, 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 -;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -;; 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. - -;;; Commentary: - -;; This collection of functions implements lunar phases for calendar.el and -;; diary.el. - -;; Based on ``Astronomical Formulae for Calculators,'' 3rd ed., by Jean Meeus, -;; Willmann-Bell, Inc., 1985. -;; -;; WARNING: The calculations will be accurate only to within a few minutes. - -;; The author would be delighted to have an astronomically more sophisticated -;; person rewrite the code for the lunar calculations in this file! - -;; Comments, corrections, and improvements should be sent to -;; Edward M. Reingold Department of Computer Science -;; (217) 333-6733 University of Illinois at Urbana-Champaign -;; reingold@cs.uiuc.edu 1304 West Springfield Avenue -;; Urbana, Illinois 61801 - -;;; Code: - -(if (fboundp 'atan) - (require 'lisp-float-type) - (error "Lunar calculations impossible since floating point is unavailable.")) - -(require 'solar) - -(defun lunar-phase-list (month year) - "List of lunar phases for three months starting with Gregorian MONTH, YEAR." - (let ((end-month month) - (end-year year) - (start-month month) - (start-year year)) - (increment-calendar-month end-month end-year 3) - (increment-calendar-month start-month start-year -1) - (let* ((end-date (list (list end-month 1 end-year))) - (start-date (list (list start-month - (calendar-last-day-of-month - start-month start-year) - start-year))) - (index (* 4 - (truncate - (* 12.3685 - (+ year - ( / (calendar-day-number (list month 1 year)) - 366.0) - -1900))))) - (new-moon (lunar-phase index)) - (list)) - (while (calendar-date-compare new-moon end-date) - (if (calendar-date-compare start-date new-moon) - (setq list (append list (list new-moon)))) - (setq index (1+ index)) - (setq new-moon (lunar-phase index))) - list))) - -(defun lunar-phase (index) - "Local date and time of lunar phase INDEX. -Integer below INDEX/4 gives the lunation number, counting from Jan 1, 1900; -remainder mod 4 gives the phase: 0 new moon, 1 first quarter, 2 full moon, -3 last quarter." - (let* ((phase (calendar-mod index 4)) - (index (/ index 4.0)) - (time (/ index 1236.85)) - (date (+ (calendar-absolute-from-gregorian '(1 0.5 1900)) - 0.75933 - (* 29.53058868 index) - (* 0.0001178 time time) - (* -0.000000155 time time time) - (* 0.00033 - (solar-sin-degrees (+ 166.56 - (* 132.87 time) - (* -0.009173 time time)))))) - (sun-anomaly (mod - (+ 359.2242 - (* 29.105356 index) - (* -0.0000333 time time) - (* -0.00000347 time time time)) - 360.0)) - (moon-anomaly (mod - (+ 306.0253 - (* 385.81691806 index) - (* 0.0107306 time time) - (* 0.00001236 time time time)) - 360.0)) - (moon-lat (mod - (+ 21.2964 - (* 390.67050646 index) - (* -0.0016528 time time) - (* -0.00000239 time time time)) - 360.0)) - (adjustment - (if (memq phase '(0 2)) - (+ (* (- 0.1734 (* 0.000393 time)) - (solar-sin-degrees sun-anomaly)) - (* 0.0021 (solar-sin-degrees (* 2 sun-anomaly))) - (* -0.4068 (solar-sin-degrees moon-anomaly)) - (* 0.0161 (solar-sin-degrees (* 2 moon-anomaly))) - (* -0.0004 (solar-sin-degrees (* 3 moon-anomaly))) - (* 0.0104 (solar-sin-degrees (* 2 moon-lat))) - (* -0.0051 (solar-sin-degrees (+ sun-anomaly moon-anomaly))) - (* -0.0074 (solar-sin-degrees (- sun-anomaly moon-anomaly))) - (* 0.0004 (solar-sin-degrees (+ (* 2 moon-lat) sun-anomaly))) - (* -0.0004 (solar-sin-degrees (- (* 2 moon-lat) sun-anomaly))) - (* -0.0006 (solar-sin-degrees - (+ (* 2 moon-lat) moon-anomaly))) - (* 0.0010 (solar-sin-degrees (- (* 2 moon-lat) moon-anomaly))) - (* 0.0005 (solar-sin-degrees - (+ (* 2 moon-anomaly) sun-anomaly)))) - (+ (* (- 0.1721 (* 0.0004 time)) - (solar-sin-degrees sun-anomaly)) - (* 0.0021 (solar-sin-degrees (* 2 sun-anomaly))) - (* -0.6280 (solar-sin-degrees moon-anomaly)) - (* 0.0089 (solar-sin-degrees (* 2 moon-anomaly))) - (* -0.0004 (solar-sin-degrees (* 3 moon-anomaly))) - (* 0.0079 (solar-sin-degrees (* 2 moon-lat))) - (* -0.0119 (solar-sin-degrees (+ sun-anomaly moon-anomaly))) - (* -0.0047 (solar-sin-degrees (- sun-anomaly moon-anomaly))) - (* 0.0003 (solar-sin-degrees (+ (* 2 moon-lat) sun-anomaly))) - (* -0.0004 (solar-sin-degrees (- (* 2 moon-lat) sun-anomaly))) - (* -0.0006 (solar-sin-degrees (+ (* 2 moon-lat) moon-anomaly))) - (* 0.0021 (solar-sin-degrees (- (* 2 moon-lat) moon-anomaly))) - (* 0.0003 (solar-sin-degrees - (+ (* 2 moon-anomaly) sun-anomaly))) - (* 0.0004 (solar-sin-degrees - (- sun-anomaly (* 2 moon-anomaly)))) - (* -0.0003 (solar-sin-degrees - (+ (* 2 sun-anomaly) moon-anomaly)))))) - (adj (+ 0.0028 - (* -0.0004 (solar-cosine-degrees - sun-anomaly)) - (* 0.0003 (solar-cosine-degrees - moon-anomaly)))) - (adjustment (cond ((= phase 1) (+ adjustment adj)) - ((= phase 2) (- adjustment adj)) - (t adjustment))) - (date (+ date adjustment)) - (date (+ date (/ (- calendar-time-zone - (solar-ephemeris-correction - (extract-calendar-year - (calendar-gregorian-from-absolute - (truncate date))))) - 60.0 24.0))) - (time (* 24 (- date (truncate date)))) - (date (calendar-gregorian-from-absolute (truncate date)))) - (list date (solar-time-string time date) phase))) - -(defun lunar-phase-name (phase) - "Name of lunar PHASE. -0 = new moon, 1 = first quarter, 2 = full moon, 3 = last quarter." - (cond ((= 0 phase) "New Moon") - ((= 1 phase) "First Quarter Moon") - ((= 2 phase) "Full Moon") - ((= 3 phase) "Last Quarter Moon"))) - -(defun calendar-phases-of-moon () - "Create a buffer with the lunar phases for the current calendar window." - (interactive) - (message "Computing phases of the moon...") - (let ((m1 displayed-month) - (y1 displayed-year) - (m2 displayed-month) - (y2 displayed-year) - (lunar-phases-buffer "*Phases of Moon*")) - (increment-calendar-month m1 y1 -1) - (increment-calendar-month m2 y2 1) - (set-buffer (get-buffer-create lunar-phases-buffer)) - (setq buffer-read-only nil) - (calendar-set-mode-line - (if (= y1 y2) - (format "Phases of the Moon from %s to %s, %d%%-" - (calendar-month-name m1) (calendar-month-name m2) y2) - (format "Phases of the Moon from %s, %d to %s, %d%%-" - (calendar-month-name m1) y1 (calendar-month-name m2) y2))) - (erase-buffer) - (insert - (mapconcat - '(lambda (x) - (let ((date (car x)) - (time (car (cdr x))) - (phase (car (cdr (cdr x))))) - (concat (calendar-date-string date) - ": " - (lunar-phase-name phase) - " " - time))) - (lunar-phase-list m1 y1) "\n")) - (goto-char (point-min)) - (set-buffer-modified-p nil) - (setq buffer-read-only t) - (display-buffer lunar-phases-buffer) - (message "Computing phases of the moon...done"))) - -;;;###autoload -(defun phases-of-moon (&optional arg) - "Display the quarters of the moon for last month, this month, and next month. -If called with an optional prefix argument, prompts for month and year. - -This function is suitable for execution in a .emacs file." - (interactive "P") - (save-excursion - (let* ((completion-ignore-case t) - (date (calendar-current-date)) - (displayed-month - (if arg - (cdr (assoc - (capitalize - (completing-read - "Month name: " - (mapcar 'list (append calendar-month-name-array nil)) - nil t)) - (calendar-make-alist calendar-month-name-array))) - (extract-calendar-month date))) - (displayed-year - (if arg - (calendar-read - "Year (>0): " - '(lambda (x) (> x 0)) - (int-to-string - (extract-calendar-year (calendar-current-date)))) - (extract-calendar-year date)))) - (calendar-phases-of-moon)))) - -(defun diary-phases-of-moon () - "Moon phases diary entry." - (let* ((index (* 4 - (truncate - (* 12.3685 - (+ (extract-calendar-year date) - ( / (calendar-day-number date) - 366.0) - -1900))))) - (phase (lunar-phase index))) - (while (calendar-date-compare phase (list date)) - (setq index (1+ index)) - (setq phase (lunar-phase index))) - (if (calendar-date-equal (car phase) date) - (concat (lunar-phase-name (car (cdr (cdr phase)))) " " - (car (cdr phase)))))) - -(provide 'lunar) - -;;; lunar.el ends here |