Question

why there are 28 days in February month?​

Answer 1

The second king of Rome, Numa Pompilius, decided to make the calendar more accurate by syncing it up with the actual lunar year—which is about 354 days long. Numa tacked on two months—January and February—after December to account for the new days. The new months each had 28 days.

Answer 2

Answer:

So he added January and February to the end of calendar. Because Roman believe d even number to be unlucky, each month had odd number of days, which alternated between 29 and 31.But ,in order to reach 355 days, on month had to be an even number. February was chosen to be the unlucky month with 28 days.