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A year is a leap year if it is divisible by 4, except for the last year in every century (years divisible by 100), that in order to be leap years, also should be divisable by 400.
The following years were leap years: 1892, 1896, 1904 y 1908. However, 1900 was not a leap year since it is divisible by 100.
The rule about 400 was used for the year 2000 but it will not be applied again until year 2400.
We have leap years in order to keep the calendar synchronized with the seasons of the year.
This is because the round trip the earth makes around the sun lasts a bit less than 365.25 days.
Without the leap years, the seasons would move a bit every year with respect to the calendar.
February is the only month that has a variable number of days.
In a normal year, February has 28 days while in leap years it has 29.