A calendar was an urgent subject. The astronomers decided to have 365 days in a year for three years. Then every fourth year they would have a leap year with 365 days in it. Since they neglected 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. So, they had 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. To get more information everyone should read the story to the end. As for Julius Caesar, he named a month for himself – July – of course, it was given 31 days. The next month was named for Augustus Caesar who became emperor a few years later. But it had only 30 days. Another day was taken from February to add a day to August. Thus, February was left with 28 days except in a leap year. Those rulers were quite sage rulers – they gave the calendar to new generation. The names for the months came from Roman names and the weeks are like those in Caesar’s calendar, too. It should be said that Caesar’s plan of leap years and his astronomers’ designs was followed for about 1, 600 years. But by that time dates had slipped a little out of place in the seasons. The trouble was that a year is not quite 365 ¼ days long. Caesar’s calendar put in leap years too often. Get more information – Pope Gregory decided to correct this mistake. He asked an Italian astronomer to help him work out a better rule for leap years. The rule is as follows: if a year number can be divided by 4, it is a leap year unless it can be divided by 100. Even if it can be divided by 100, it is a leap year if it can be divided by 400. As for dates, they were also subjected to changes. To put the dates back in their proper places in the seasons, Pope Gregory moved the dates up 10 days. October 5 of that year became October 15. At the same time January was made New Year’s Day. Before that time March 25 had been the first day of the New Year. It must be noticed that both Pope Gregory’s calendar and his rule for leap years are still working well.