1. He was the first computist to recognize the 532-year cycle of Easters in the Julian calendar.

2. August is the eighth month of the year in the Gregorian calendar and its predecessor, the Julian calendar

3. April is the fourth month of the year in the Gregorian calendar and its predecessor, the Julian calendar

4. The Gregorian Calendar is a reformed version of the Julian Calendar, which was itself a modification of the ancient Roman Calendar

5. After assuming control of government, Caesar began a program of social and governmental reforms, including the creation of the Julian calendar.

6. In addition, the lunar tables of the Julian calendar are four days (sometimes five days) behind those of the Gregorian calendar.

7. The Bolsheviki abolished the Julian calendar during our stay in Moscow, and adopted a system that brought Russia in line with common usage

8. Many people credit Julius Caesar for the use of the leap year in his Julian calendar, but he almost certainly took the ideas from the Egyptians.

9. In his longest and most original book, Sacrobosco correctly described the defects of the then-used Julian calendar, and, three centuries before its implementation, recommended a solution much like the modern Gregorian calendar.