Church Calendar: East & West

Most church calendars pick one tradition and never tell you which. This one puts two reckonings on the same row. For every moveable date — Ash Wednesday or Clean Monday, Palm Sunday, Holy Week, Easter or Pascha, Ascension, Pentecost — you get the Western date and the Eastern date side by side, and the number of days apart they fall that year. Any year, not just this one. Type a year from 1583 to 2200 and the whole table is recomputed. Nothing is downloaded and nothing is kept on a server; the dates come from arithmetic that runs on the phone. Years outside that range are refused rather than guessed, because a date this app has not checked is worse than no date. It says which reckoning it is using. Each column is labelled. The West column is the Gregorian computus. The East column is the Julian computus, converted — and the conversion offset is not a constant: ten days in the sixteen…