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igneus/feast_of_lord_first_vespers.rb

Created September 13, 2022 18:08
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In which years does each feast of the Lord fall on Sunday and is thus celebrated with first Vespers?
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feast_of_lord_first_vespers.rb
# In which years does each feast of the Lord fall on Sunday and is thus celebrated with first Vespers?
require 'calendarium-romanum/cr'
years = 2000 .. 2100
sanctorale = CR::Data::GENERAL_ROMAN_ENGLISH.load
sanctorale
.each_day
.select {|_,celebrations| celebrations.first.rank == CR::Ranks::FEAST_LORD_GENERAL }
.collect {|_,celebrations| celebrations.first }
.each do |celebration|
puts celebration.title
puts \
years
.select {|y| celebration.date.concretize(y).sunday? }
.collect(&:to_s)
.join(', ')
end
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