Ordo: Church Calendar

Ordo is the liturgical calendar of the Roman Rite, worked out on your phone. Open it and it tells you where you are in the Church's year: the season, the celebration, its rank and its colour, the saint of the day, and the readings appointed for it. Nothing is downloaded and nothing is looked up. Easter is computed from the arithmetic that defines it, and the whole moving year - Ash Wednesday, Palm Sunday, Ascension, Pentecost, Christ the King - is derived from that one date. No account, no network call, no data file to keep current. It answers for 2031 exactly as it answers for today. THE DAY - Season, week and weekday in the Church's own reckoning - The celebration, its rank and its liturgical colour - The saint of the day, with a short historical note - Reading citations for the day: Sunday cycle A/B/C, weekday cycle I/II - Which hour of the day it is, by the clock or by the Sun THE YEAR - Every day from the First Sunday of Advent to the eve of the next, coloured by season - Step from any year to any other, forward or back - Easter, and everything that hangs off it - The Julian paschalion beside the Gregorian, so the divergence is visible rather than asserted THE SAINTS - 217 celebrations of the General Roman Calendar - Search by name or by patronage - Name days: type a first name and the calendar matches it across languages. John, Ivan, Johannes, Jean and Juan are one saint under five spellings, and a name day is why half of Europe installs a calendar at all. THE HOURS - Lauds, Terce, Sext, None, Vespers, Compline - By the clock, or by the Sun: the daylight divided into twelve as it was before clocks, so an hour in June is longer than an hour in December. Set a place and sunrise and sunset are computed for it. REGIONAL OPTIONS The same feast falls on different dates under different bishops' conferences, and the app does not quietly choose one. Three switches, set to the universal calendar by default: - Epiphany on 6 January, or on the Sunday between 2 and 8 January - Ascension on the Thursday, or on the following Sunday - Corpus Christi on the Thursday, or on the following Sunday Moving Epiphany moves the Baptism of the Lord with it, and that moves the start of Ordinary Time. The app follows the consequence instead of leaving the year inconsistent. HOW IT IS CHECKED The Easter computation is tested across 1583-2500: always a Sunday, always between 22 March and 25 April, with both extremes required to actually occur (22 March 1818, 25 April 2038). The gap between the Gregorian and Julian dates is derived over 1900-2100 and has to come out as 0, 7, 28 or 35 days, and nothing else. The transfer rules are pinned to 2008, the year of the earliest Easter in living memory, when Saint Joseph moved from 19 to 15 March and the Annunciation from 25 to 31 March. READ Fifteen articles: how Easter is worked out step by step, why the Orthodox date usually falls later, why the paschal full moon is not the moon in the sky, why the year begins in Advent, why Ordinary Time counts backwards and skips a week, what becomes of a solemnity that cannot be kept, and what the 1969 revision changed. WIDGET The day, the celebration and the saint on the home screen, in the liturgical colour of the day - violet through Lent, green in Ordinary Time. WHAT IT IS NOT Not a missal and not a breviary: Ordo gives the citation, "Mk 1:14-20", and not the text of the reading. It covers the General Roman Calendar of the 1969 revision, not the 1962 calendar and not the Byzantine rite. Free to install, with ads. A single one-time purchase removes them.