The date of Easter is different every year. Not only does the date change because Easter is always on a Sunday, but also because it's always the date of the first full moon after the spring equinox. That means it can be anytime between March 22 and April

Since its first publication in 1988, the New Dictionary of Theology has been widely appreciated by students and readers as a trustworthy and informative guide. After almost thirty years, however, there are many new writers, issues and themes on the agenda, for theology does not stand still. Hence, this completely revised second edition includes over 400 new articles in the full set of over 800. Many of the original articles have been expanded and updated, and almost all have additional bibliographical references. Since material on biblical theology is now covered at length in IVP's New Dictionary of Biblical Theology, this volume is therefore more specifically a dictionary of historical and systematic theology. The New Dictionary of Theology: Historical and Systematic has an international team of contributors, and many are acknowledged experts in their fields. The Dictionary combines excellence in scholarship with a high standard of clarity and insight into current theological issues, yet it avoids being unduly technical. Students, teachers and ministers, as well as scholars and everyone seeking a better understanding of theology, will value it as an indispensable reference work. The volume is enhanced by a spacious and clear design, an extensive and easy-to-use cross-reference system and bibliographies which feature the best and most readily available works in English.

The Quartodecimans were early Christians who maintained the tradition derived from Judaism, and observed Pascha at the same time that the Jews observed Passover. In this work, Alistair Stewart, the leading authority on Melito and the Quartodecimans, presents a unique collection of material in a form ideal for classroom use as well as for the general reader. At the head of this newly revised collection stand the original Greek text and an updated translation. Alongside this is an extensive introduction and annotation pointing out not only the parallels to Jewish practice, but also offering an analysis of the work in terms of classical rhetoric. Further, in this edition the translator has included an expanded selection of Melito's fragments, testimonia to Melito, and other material vital for understanding the Quartodeciman liturgies from Rome, Syria, and Asia.

This Encyclopedia traces the history of the oldest science from the ancient world to the space age in over 300 entries by leading experts.

Church and Theology in the Modern Era covers the period from the Reformation to the end of the eighteenth century and is based on lectures delivered by Baur in the 1840s and 1850s. It was published after his death as the fourth volume of his church history. The first and last volumes (Christianity and the Christian Church of the First Three Centuries and Church and Theology in the Nineteenth Century) have appeared in English translation from Wipf and Stock. This book contains a wealth of information, not only about the well-known figures of the Reformation and its aftermath, but also about other important persons who are often overlooked. It attends to both Protestant and Catholic history and shows that this is the most turbulent period in church history since the early years of Christianity. Ecclesiastical and political controversies are often intertwined, and momentous decisions are made that affect the modern world.