A leap year occurs every four years when a year is divisible by 4. However, years divisible by 100 are exceptions, unless divisible by 400. This adjustment compensates for the Earth’s orbit, keeping the calendar year synchronized with the astronomical year.

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In the Gregorian calendar, which is the calendar system most widely used today, a year is considered a leap year if it is divisible by 4. However, there is an exception to this rule: years divisible by 100 are not leap years unless they are also divisible by 400.

So, the rules for determining a leap year are as follows:

1. If the year is divisible by 4, go to step 2. If not, it’s not a leap year.

2. If the year is divisible by 100, go to step 3. If not, it is a leap year.

3. If the year is divisible by 400, it is a leap year. If not, it is not a leap year.

For example:

– The year 2000 is divisible by 4, 100, and 400, so it is a leap year.

– The year 1900 is divisible by 4 and 100 but not by 400, so it is not a leap year.

– The year 2024 is divisible by 4 but not by 100, so it is a leap year.