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Orthodox calendar 2018

Orthodox calendar (Russian Orthodox Church) with feasts and fasts for each year (perpetual calendar). Works offline.
Beginning of Great Lent - 19.02.2018, Pascha - 08.04.2018, Pentecost - 27.05.2018.
Orthodox calendar for year 2017, for year 2019.
In Android you can download and open the calendar with Firefox.

Notes

1. How Easter is calculated
2. Orthodox feasts
3. Days of the remembrance of the departed
4. Orthodox fast

1. Easter is calculated using Gauss formula.

a = [(19 * [Y / 19] + 15) / 30], where Y - year, [] - residue of division;
b = [(2 * [Y / 4] + 4 * [Y / 7] + 6 * a + 6) / 7];
If (a + b) > 10 then Easter is (a + b - 9) of April (old calendar) else (22 + a + b) of March (old calendar). Thus the date of Easter can be from 22.03 to 25.04 (old calendar) or from 04.04 to 08.05 (new calendar).

2. Feasts are set off with red color.

Immovable feasts:
07.01 - Nativity of Christ (12 great feasts)
14.01 - Circumcision of Christ (great feast)
19.01 - Theophany. Baptism of Christ (12 great feasts)
15.02 - Presentation of Christ (12 great feasts)
07.04 - Annunciation (12 great feasts)
21.05 - John the Theologian
22.05 - St. Nicolas the Miracle-Worker
07.07 - Nativity of St. John the Forerunner (great feast)
12.12 - Apostles Peter and Paul (great feast)
19.08 - Transfiguration of Jesus Christ (12 great feasts)
28.08 - Dormition of the Theotokos (12 great feasts)
11.09 - Beheading of St. John the Forerunner (great feast)
21.09 - Nativity of the Theotokos (12 great feasts)
27.09 - Elevation of the Holy Cross (12 great feasts)
09.10 - John the Theologian
14.10 - Protection of the Theotokos (great feast)
04.12 - Presentation of the Theotokos (12 great feasts)
19.12 - St. Nicolas the Miracle-Worker

Movable feasts:
04.02.2018 - Synaxis of new Russian martyrs
21.01.2018 - Sunday of Zaccheus
28.01.2018 - Sunday of the Publican and Pharisee
04.02.2018 - Sunday of the Prodigal Son
11.02.2018 - Sunday of the Last Judgment
12.02.2018 - Meatfare week
18.02.2018 - Sunday of Forgiveness. Expulsion of Adam and Eve from Paradise
25.02.2018 - Sunday of Orthodoxy
04.03.2018 - Sunday of St. Gregory Palamas
11.03.2018 - Sunday of the Holy Cross
18.03.2018 - Sunday of St. John Climacus
25.03.2018 - Sunday of St. Mary of Egypt
31.03.2018 - Lazarus Saturday
01.04.2018 - Palm Sunday (12 great feasts)
02.04.2018 - Holy Monday
03.04.2018 - Holy Tuesday
04.04.2018 - Holy Wednesday
05.04.2018 - Holy Thursday. Last Supper
06.04.2018 - Holy Friday. Crucifixion of Christ
07.04.2018 - Holy Saturday. Christ's descent into Hades
08.04.2018 - Resurrection of the Lord. Pascha
15.04.2018 - Sunday of St. Thomas. Antipascha
22.04.2018 - Sunday of Myrrh-bearing Women
29.04.2018 - Sunday of the Paralytic
06.05.2018 - Sunday of the Samaritan Woman
13.05.2018 - Sunday of the Blind Man
17.05.2018 - Ascension of Christ (12 great feasts)
20.05.2018 - Sunday of the Fathers of the First Ecumenical Council
27.05.2018 - Pentecost (12 great feasts)
28.05.2018 - Day of the Holy Spirit
03.06.2018 - Sunday of all Saints
10.06.2018 - Sunday of all Russian Saints

3. Days of the remembrance of the departed are set off in back color.

10.02.2018 - Paternal Saturday
03.03.2018 - Paternal Saturday
10.03.2018 - Paternal Saturday
17.03.2018 - Paternal Saturday
17.04.2018 - Day of Rejoicing
26.05.2018 - Paternal Saturday
09.05 - Remembrance of the departed soldiers
03.11.2018 - Demetrius (Parental) Saturday

4. Fast days are set off in background colors.

Meat is excluded
Fast
Strict fast