(** Ecclesiastical Easter. See docs/research/rules-register.md §0.
    Both functions are total for a year in 1583..9999. *)

(** Easter Sunday by the Gregorian reckoning (OF + EF). *)
val gregorian_easter : int -> Date.t

(** Easter Sunday by the Julian reckoning, returned as the equivalent proleptic
    Gregorian date (for future eastern rites; EF/OF use {!gregorian_easter}). *)
val julian_easter : int -> Date.t