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.

In 46 BC, Julius Caesar swept away the chaotic Roman calendar and imposed order on how humanity would measure time. Yet even his reform, brilliant as it was, drifted from the heavens it attempted to track. Nearly sixteen centuries later, Pope Gregory XIII assembled the finest mathematicians of the age to correct what Caesar could not and the Church would not. This 1893 treatise walks through that epic失败的 reckoning with astronomical reality, explaining exactly where the Julian calendar went wrong, how the Gregorian reform fixed it, and why the correction required ten days to simply vanish from history. Packer provides practical methods for readers to calculate Dominical letters, determine the day of the week for any date from Caesar's era to the year 4000, and fix the ever-shifting date of Easter. He extends the inquiry to the Hebrew calendar and its correspondence with biblical events. Written as a teaching tool that grew beyond its original scope, the book blends historical narrative with genuine mathematical instruction. For puzzle-solvers, history of science enthusiasts, and anyone curious about the invisible machinery organizing human time, this volume offers a window into an era when calendar reform was a matter of both scientific urgency and theological stakes.