Today, February 29th , is a leap day - a relatively rare occurrence. Advised by Alexandrian astronomer Sosigenes , Roman dictator Julius Caesar , pictured above in a self-decreed minted coin, created a calender system in 46 BC that contained one leap day every four years. In fact, one year by these astronomical definitions is about 365.24219 days. If all calendar years contained 365 days, they would drift from the actual year by about 1 day every 4 years. By making most years 365 days but every fourth year 366 days, the calendar year and the actual year remained more nearly in step.
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