;; Cf holiday-fixed, holiday-islamic.
;; With a +- 3 month calendar window, and 19 months per year,
;; month 16 is special. When m16 is central is when the
;; Cf holiday-fixed, holiday-islamic.
;; With a +- 3 month calendar window, and 19 months per year,
;; month 16 is special. When m16 is central is when the