Maundy Thursday uses the term "Maundy Thursday" to refer to the holy day in its official sources. In the Eastern Orthodox Church, the name for the holy day is, in the Byzantine Rite, "Great and Holy Thursday" or "Holy Thursday", and in Western Rite Orthodoxy "Maundy Thursday", "Holy Thursday" or both. The Coptic Orthodox Church uses the term "Covenant Thursday" or "Thursday of the Covenant". In the Maronite Church and the Syriac Orthodox Church, the name is "Thursday of Mysteries". "Maundy Thursday" is the official name of the day in the civil legislation of England and the Philippines. The day has also
Armelin's calendar mind of modest ability will learn in a few minutes the weekday with which each month invariably begins, and will be able to compute quickly the day of the week upon which any day of any month falls. Each stated holiday falls upon its invariable day of the week. Thanksgiving Day falls always on November 30. A major disadvantage is for sabbatarians, who are obliged to worship every seventh day. Their holy day will occur on a different weekday every year. Armelin's project received the first premium of the French Astronomical Society. The World Calendar, roughly identical, has been promoted