Index: emacs/lisp/calendar/solar.el
diff -c emacs/lisp/calendar/solar.el:1.51 emacs/lisp/calendar/solar.el:1.52
*** emacs/lisp/calendar/solar.el:1.51 Wed Mar 30 16:55:58 2005
--- emacs/lisp/calendar/solar.el Fri May 6 20:56:52 2005
***************
*** 4,9 ****
--- 4,10 ----
;; Author: Edward M. Reingold <[EMAIL PROTECTED]>
;; Denis B. Roegel <[EMAIL PROTECTED]>
+ ;; Maintainer: Glenn Morris <[EMAIL PROTECTED]>
;; Keywords: calendar
;; Human-Keywords: sunrise, sunset, equinox, solstice, calendar, diary,
;; holidays
***************
*** 207,212 ****
--- 208,218 ----
(defun solar-setup ()
"Prompt user for latitude, longitude, and time zone."
+ (unless (or (and calendar-longitude calendar-latitude calendar-time-zone)
+ (interactive-p))
+ ;; Defaults must be nil, else results could be subtlely wrong for
+ ;; user's real location.
+ (error "Calendar latitude, longitude and/or time-zone unset"))
(beep)
(if (not calendar-longitude)
(setq calendar-longitude
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