The development of Caesar's calender

The early Greek had a calendar much like the Babylonian calender.So did the early Roman.But in Rome politics began to have something to do with the calendar .Whenever the priests did not like someone who was elected to an office,they would make his term short by not putting an extra month in the year even if it was required.On the other hand,they put in extra months,even when they were not needed,to make the terms of some officials longer.When Julius Caesar became the ruler of the Roman Empire,the calendar was very badly mixed up.Caesar decided to throw out their moon-month calender and start over.He asked some astronomers to help.For the new calendar they borrowed the idea of the year from Egyptians.The Egyptians had worked out the length of their year by watching the bright star Sirius.Their year began when Sirius appeared in the eastern sky at dawn,and was 365 days long.Caesar's astronomers decided that a year should be 365 1/4 days long.They decided to have 365 days in a year for three years . Then every fourth year they would have a leap year with 366days in it.Since they had decided not to have true moon months,they could make the months any length they pleased.They chose to divide the year into 12 months of about the same length.It was easy to see that they could have five 31 day months and seven 30 -day months.The Romans thought that odd numbers were lucky.To get an extra 31-day month,they took a day from a 30-day month-from February.