Reckoning of Years

From Tolkien Gateway

The Reckoning of Years was a book written by Merry Brandybuck sometime after the War of the Ring. In this work Merry discussed the relation of the calendars of the Shire and of Bree to those of Rivendell, Gondor, and Rohan.

This book was one of the important tomes kept in the library of Bucklebury, perhaps one of those important works that weren't copied into the Red Book.[1]


"Reckoning of Years" is a rendering into English of De Temporum Ratione, the title of an important treatise on astronomy and timekeeping by the seventh-century English monk Bede. This work is the sole source of the Anglo-Saxon names of the months of the year, which Tolkien adapted for the Shire Calendar.

Tolkien likely intended this work to be taken as the source for the information in "Appendix D" of The Lord of the Rings, although the Prologue suggests that it wasn't included in the Red Book.