Question

why there are 29/28 days in February

Answer 1

because earth takes 365 days and 6 hours . this 6 hours add every 4 years and make feb 29 days

Answer 2

Once in every 4 years, February has 29 days because the earth takes 365 days and 6 hours to complete it's one revolution. But only 365 days are considered in a year. These 6 hours add upto 24 hours after 4 years and hence we get one whole day as a result.

HOPE IT PROVES TO BE HELPFUL.