Many centuries back, a Roman King called Numa made a calendar according to 12 lunar cycles which approximately take 354 days. But as even numbers were considered unlucky, Numa rounded off days to 355. He also made each month odd-numbered, leaving one month, i.e., Februaries with 28 days to reach the total of 355.
But as the earth takes 365.24 days to travel around the sun, seasons and weather conditions started mismatching with the 355-day calendar.
Then came Julius Caesar who decided to follow the solar calendar of the Egyptians that had Januarius and Februaries in the beginning. He made the calendar into 365 days by adding days in each month except February. As still 0.24 days were pending each year, after every 4 years, he added 1 day to February, making it a leap year. Thus, February has 28 days except during leap year.
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