Question

why February has 28 ?

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 28days.

Answer 2

as the second king of Rome namely Numa pompilius decided that a year may have 355/354 days so he finally said february should have 28 days

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