Excerpted from A Guide to Jewish Prayer with permission of the publisher, Schocken Books.
During the course of the year, there are various days of fasting on which, in addition to the fast itself, there are a number of changes and additions in the order of prayer services. (Yom Kippur, although a day of fasting, is not considered among these, because it is essentially a festival, and the fasting on that day is intended for purification and spiritual elevation).
The fast days may be categorized, on the basis of their essence and the customs practiced on them, as follows: (a) Tisha B’Av (the Ninth of Av), whose laws, customs, and prayers give it a unique status; (b) fast days held in memory of tragic events: some are mentioned in the Bible; other, later ones, are either recognized by all Jewish communities, or are kept only by particular communities; (c) fixed fast days for atonement and purification; (d) other fixed fasts; (e) fast days declared on the occasion of public calamities, whenever they occur.
The Service on Memorial Fast Days
All these [memorial] fast days share a common pattern of laws and customs. The fast itself only applies during the daytime (from dawn till nightfall). When one of these days occurs on Shabbat, it is postponed to Sunday. The Fast of Esther is not postponed till the following day, because that day is Purim; instead, it is brought forward to Thursday, as Friday is also not an appropriate day for fasting (the one exception to this is the Tenth of Tevet, on which we fast even when it falls, as it occasionally does, on a Friday).
The Ma’ariv [evening] service is conducted as on regular weekdays (since the fast doesn’t begin until the following morning).
Shaharit [morning service], through the Amidah [central standing prayer]remains the same as on weekdays. The Shaliah Tzibbur [service leader] repeats the Amidah as on weekdays, but after Go’el Yisrael [the benediction "Redeemer of Israel"]he adds Anenu ["answer us"]as a complete benediction, which ends with the words "Blessed are You, O Lord, who answers [His people Israel] in times of distress."
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