The classical Babylonian calendar was a lunisolar calendar with a fixed 19-year Metonic cycle.
Examples
if (FALSE) { # \dontrun{
tibble::tibble(
gregorian = gregorian_date(2335, 1, 1:2),
babylonian = as_babylonian(gregorian)
)
babylonian_date(2335, 6, FALSE, 1:2)
} # }
