(CNN)Here's some background information about leap year. 2020 is a leap year. The next leap day is February 29, 2020, on a Saturday.
Every four years in the Gregorian calendar, an extra day is added to the calendar in order to synchronize it with the solar year.
- Ex. 800, 1200, 2000 were leap years...BUT 1700 and 1900 were not because they are not divisible by 400, even though they are divisible by four.