orgmode configuration of agenda (sunrise and sunset)

init.el

;; learn from https://github.com/AbstProcDo/Master-Emacs-From-Scrach-with-Solid-Procedures/blob/master/05.Emacs-as-a-Agenda-by-Org.org

(setq org-agenda-include-diary t)
(setq org-agenda-diary-file "your/path/to/standard-diary")
(setq diary-file "your/path/to/standard-diary")

;; 设置本地经纬度坐标
(setq calendar-latitude 39.9042)
(setq calendar-longitude 116.4074)

;;Sunrise and Sunset
;;日出而作, 日落而息
(defun diary-sunrise ()
  (let ((dss (diary-sunrise-sunset)))
    (with-temp-buffer
      (insert dss)
      (goto-char (point-min))
      (while (re-search-forward " ([^)]*)" nil t)
        (replace-match "" nil nil))
      (goto-char (point-min))
      (search-forward ",")
      (buffer-substring (point-min) (match-beginning 0)))))

(defun diary-sunset ()
  (let ((dss (diary-sunrise-sunset))
        start end)
    (with-temp-buffer
      (insert dss)
      (goto-char (point-min))
      (while (re-search-forward " ([^)]*)" nil t)
        (replace-match "" nil nil))
      (goto-char (point-min))
      (search-forward ", ")
      (setq start (match-end 0))
      (search-forward " at")
      (setq end (match-beginning 0))
      (goto-char start)
      (capitalize-word 1)
      (buffer-substring start end))))