6. He switched the Roman calendar to a 365 day system
Prior to Caesar’s rule, the Romans used a lunar calendar. This system was problematic because each year was only 355 days-10 and a quarter days short of a solar year. Since the lunar calendar doesn’t neatly track the solar seasons, Roman officials had to add days to the calendar every year to make it line up with the seasons. Caesar put an end to the confusion by decreeing that the Roman calendar follow a solar 365 day system. To make sure the system tracked the solar year closely, every 4th year, Caesar would add a day to the calendar. That’s how the leap year was born.
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