Why is there a Leap Year

Why is there a Leap Year:

The reasoning behind a leap year is that, seasons and astronomical events in a solar year do not repeat in an exact number of full days. Adding an extra day to the calendar every four years, compensates for the fact that a solar year is almost 6 hours longer than 365 days.Therefore this keeps the calendar year synchronised with the solar year.

A solar year or tropical year,(which is 365 days, 5 hours, 49 minutes, and 12 seconds) is the length of time the Sun, as seen from the Earth, takes to return to the same position along the ecliptic (its path among the stars on the celestial sphere) relative to the equinoxes and solstices. Another words how long it takes the earth to travel once around the Sun back to the same position.

Every year that is exactly divisible by four is a leap year, except for years that are exactly divisible by 100; the centurial years that are exactly divisible by 400 are still leap years.In a leap year, the month of February has 29 days instead of 28.

A common year is 365 days = 8,760 hours = 525,600 minutes = 31,536,000 seconds.
A leap year is 366 days = 8,784 hours = 527,040 minutes = 31,622,400 seconds.