Why February has only 28 days in month, the least day of all months in a year?
According to the Roman legend, it was King Pompilius who added the months of January and February to the first calendar that was used by the Romans which was very similar to the calendar that we used today except that it only had 10 months in a year. With the addition of the two months however did not work out because it only made the year to have 355 days, still not fitting the solar year. So what the king did was to add additional month which was Mercedinus. However, this likewise did not fit with the lunar cycle. When Julius Caesar succeeded as the new king of Roman, he removed the month of Mercedinus and instead made the days of February to be 28 days and added additional one day every fourth year.
Another theory was the legend which tells about the jealousy of Augustus Caesar to Julius Caesar. The birth month of Juilius Caesar was July which had 31 days, so Augustus Caesar got one day from February and added that to his birth month August to equalize with the month of July.
Why do we add one day to February every four year or leap year?
According to some scientist, we need to add additional one day every four year or leap year in order for our time to be synchronized with the solar year. It is a fact in Science that it takes 365.25 days for our planet to complete the revolution around the sun but in our calendar, we only have 365 days in a regular year. To offset the excess 6 hours every year, which made it equivalent to one day combined altogether after four years, is the main reason why we add additional one day every four year or leap year. So why is it on February? The answer is perhaps because February had the least number of days of all months but this is likewise a theory for there was no record as to why it became this way.