Why is February 28 and sometimes 29 days?

As you all know, that is February have 28 days every year but there are also a few years in which in February have an extra day of 29 days. Usually every four years, February is 29 days Just like February is 29 days in 2020 this year, it was four years ago, the 29 days of February in 2016.

Generally, many people do not know the reason why and how one day of February increases after four years. Astronomers say that the Earth’s orbit around the sun does not last 365 days, Rather, it is 365 days, five hours 49 minutes and 12 seconds. As the earth rotates around the sun, the change in climate depends on the rotation of the earth and the sun.

Astronomers point out that if the difference of the 1/4 day is made every year, it becomes a full day after four years, and thus an extra day is added to the calendar. The historians also mentioned in the sense that in ancient times the calendar was only ten months old, that is, it started in March and ended in December.

However, when the calendar of 713 BC was released, the Roman king Nama Popelius extended the months of January and February. Usually people born February 29 don’t celebrate their birthday every year. Astronomers advised them to choose either February 28 or March 1, and celebrate their birthday four years later on February 29.