The Great Lent, which starts on March 18th and lasts for 48 days among Orthodox believers, has its own rules and rituals for each of the seven Sundays.
Here's how each week of the fasting period is named and what
the rules are:
Clean Week (Todor's
or Theodore's Sunday): The first three days of fasting begin with complete
abstinence from food and drink, known as "trimirje." Then, fasting
continues with dry fasting or fasting on water. On Thursday, fasting is on
water, while for the rest of the week, it is allowed to eat food prepared with
oil.
Pačista Sunday:
During this week, fasting on water is observed from Monday to Friday, while on
Saturday and Sunday, oil is allowed.
Sunday of the
Adoration of the Holy Cross: During this week, fasting on water is observed
from Monday to Friday, with oil allowed on Saturday, and fish allowed on
Sunday, due to the Annunciation.
Mid-Lent Sunday:
This week is fasted like the second week, with fasting on water from Monday to
Friday, while on Saturday and Sunday, oil is allowed.
Deaf Sunday: Fasting
is observed on water on Monday and Tuesday, and from Wednesday to Sunday, oil
is allowed, with the addition of wine being permitted on Friday.
Palm Sunday:
Fasting on water is observed from Monday to Friday, with oil allowed on
Saturday, and fish allowed on Sunday, which is celebrated as Palm Sunday.
Passion Sunday:
The last Sunday before Easter is marked by strict fasting, prayer, and
repentance. From Monday to Wednesday, fasting is on water, oil is allowed on
Thursday, and on Good Friday, abstaining is observed. Saturday is again fasting
on water, and Sunday marks the end of the Great Lent.