Ruby solution for week 103, part 1

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+#!/usr/bin/ruby
+
+#
+# See ../README.md
+#
+ 
+#
+# Run as: ruby ch-1.rb < input-file
+#
+
+#
+# We're reading years from standard input, one year per line, outputting
+# years from the sexagenary cycle [1]. This is slightly more than what
+# the challenge ask; the challenge asks to output the heavenly stem [2],
+# and the earthly branch [3]. But we also output its Yin/Yang.
+#
+# [1] https://en.wikipedia.org/wiki/Sexagenary_cycle
+# [2] https://en.wikipedia.org/wiki/Heavenly_Stems
+# [3] https://en.wikipedia.org/wiki/Earthly_Branches
+#
+
+#
+# Each of the cycles have been rotated so the first entry corresponds to
+# the year 0 in the Proleptic Gregorian calendar. (We're using the
+# convention of having a year 0, as per ISO 8601).
+# That way, we can just mod the year with the number of entries, without
+# first having to subtract something from the year.
+#
+# The heavenly stems last for 2 years, so we just duplicate the entries.
+#
+
+yin_yang         = ["Yang", "Yin"]
+heavenly_stems   = ["Metal",  "Metal",   "Water",  "Water", "Wood",  "Wood",
+                    "Fire",   "Fire",    "Earth",  "Earth"]
+earthly_branches = ["Monkey", "Rooster", "Dog",    "Pig",   "Rat",   "Ox",
+                    "Tiger",  "Rabbit",  "Dragon", "Snake", "Horse", "Goat"]
+
+
+ARGF . each_line do |year|
+    year = year . to_i
+    print  yin_yang         [year % yin_yang         . length] + " " +
+           heavenly_stems   [year % heavenly_stems   . length] + " " +
+           earthly_branches [year % earthly_branches . length] + "\n" 
+end
+