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#! /usr/bin/env ruby
# goodfriday.rb: Written by Tadayoshi Funaba 1998, 2000, 2002
# $Id: goodfriday.rb,v 1.1 1998-03-08 18:44:44+09 tadf Exp $
require 'date'
def easter(y)
g = (y % 19) + 1
c = (y / 100) + 1
x = (3 * c / 4) - 12
z = ((8 * c + 5) / 25) - 5
d = (5 * y / 4) - x - 10
e = (11 * g + 20 + z - x) % 30
e += 1 if e == 25 and g > 11 or e == 24
n = 44 - e
n += 30 if n < 21
n = n + 7 - ((d + n) % 7)
if n <= 31 then [y, 3, n] else [y, 4, n - 31] end
end
es = Date.new(*easter(Time.now.year))
[[-9*7, 'Septuagesima Sunday'],
[-8*7, 'Sexagesima Sunday'],
[-7*7, 'Quinquagesima Sunday (Shrove Sunday)'],
[-48, 'Shrove Monday'],
[-47, 'Shrove Tuesday'],
[-46, 'Ash Wednesday'],
[-6*7, 'Quadragesima Sunday'],
[-3*7, 'Mothering Sunday'],
[-2*7, 'Passion Sunday'],
[-7, 'Palm Sunday'],
[-3, 'Maunday Thursday'],
[-2, 'Good Friday'],
[-1, 'Easter Eve'],
[0, 'Easter Day'],
[1, 'Easter Monday'],
[7, 'Low Sunday'],
[5*7, 'Rogation Sunday'],
[39, 'Ascension Day (Holy Thursday)'],
[42, 'Sunday after Ascension Day'],
[7*7, 'Pentecost (Whitsunday)'],
[50, 'Whitmonday'],
[8*7, 'Trinity Sunday'],
[60, 'Corpus Christi (Thursday after Trinity)']].
each do |xs|
puts((es + xs.shift).to_s + ' ' + xs.shift)
end
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