Our Calendar: The Julian calendar and its errors. How corrected by the Gregorian. Rules for finding the dominical letter, and the day of the week of any event from the days of Julius Caesar 46 B.C. to the year of our Lord four thousand; a new and easy method of fixing the date of Easter. Hebrew calendar; showing the correspondence in the date of events recorded in the Bible with our present Gregorian calendar. Illustrated by valuable tables and charts.

"Our Calendar" by George Nichols Packer is a scholarly treatise on the history and mathematical principles of calendar systems, written in the late 19th century. The work delves into the transition from the Julian calendar to the Gregorian calendar, discussing the relevant historical reforms made by significant figures such as Julius Caesar and Pope Gregory XIII. Through detailed calculations and rules, Packer aims to simplify the complex processes involved in determining dates and understanding the calendar's structure, targeting those who seek a practical understanding of timekeeping. At the start of the book, the author introduces the topic by detailing the origin and evolution of the calendar. He emphasizes his personal journey through the subject, which began as a teaching endeavor and later grew into an extensive exploration prompted by his own circumstances. The opening chapters lay out definitions, the historical context of the Roman calendar, and the adjustments made under Julius Caesar and Pope Gregory XIII to correct discrepancies in timekeeping. Packer also hints at the mathematical rules that will follow, establishing a foundation for readers interested in not just the theoretical aspects but also the practical applications of calendar calculations in everyday life.