The application is designed to display information from the following sources:

1. Sequences of Divine Services on the website of the project “Sequence of Divine Services Alongside” at “https://posledovanie.rf”.

2. The official calendar of the Russian Orthodox Church on the Internet at "http://calendar.rop.ru". The content corresponds to the printed version of the Patriarchal Calendar published by the Moscow Patriarchate Publishing House.

3. Liturgical instructions on the official website of the Russian Orthodox Church at "http://www.patriarchia.ru".