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At that time, the Romans used a lunar calendar of about 354 days. As a result, intercalary months have to be inserted every so often to keep the calendar roughly on tract with the seasons (just like the Jewish calendar today).
Since 52BC only 1 intercalary month had been inserted leading to the effect that by 46BC the calendar was off by 67 days. To correct the calendar to get it back to the vernal equinox occurring on (or about) 25 March, 2 intercalary months (of 33 days and 34 days) were inserted between November and December 46BC making the year 445 days long.
Caesar then did the calendar reform which upped the days of the months to get the year to 365 days with a leap year every 4 years (starting 1 Jan 45BC) - the Julian calendar which was then later refined into the Gregorian calendar to correct for the leap years by making centuries leap years only if evenly divisible by 400.
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What is the year between AD and BC called or is it just a zero year?
no it was not called year 0 it was called AD 1
What was the year before 100 BC?
100 BC is a year. Right now it is 2010 AD.
What was the new government for rome called in 509 BC?
The government in 509 BC was called the Republic.The government in 509 BC was called the Republic.The government in 509 BC was called the Republic.The government in 509 BC was called the Republic.The government in 509 BC was called the Republic.The government in 509 BC was called the Republic.The government in 509 BC was called the Republic.The government in 509 BC was called the Republic.The government in 509 BC was called the Republic.
If you were living in the year 776 BC what century is it?
The Year 776 BC was in the 8th century BC.
When did leap years start?
In 46 BC with the creation of the Julian calendar.
