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In which years is the Second Sunday of Christmas celebrated?
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| require 'calendarium-romanum' | |
| dates = CalendariumRomanum::Temporale::Dates | |
| years = (1969..3000) | |
| has_second_sunday_of_xmas = proc do |year| | |
| dates.octave_of(dates.sunday_after(dates.nativity(year))) < | |
| dates.epiphany(year) | |
| end | |
| p years.select(&has_second_sunday_of_xmas) |
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