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For example, the year 2000 (divisible by 4, by 100, and by 400) had a February 29, while the year 1900 did not. The Gregorian calendar is still inaccurate for the solar year ...

The year 2000 was a leap year, for example, but the years 1700, 1800, and 1900 were not. The next time a leap year will be skipped is the year 2100," read an article from the Smithsonian.

It's a leap year, and today — Thursday, Feb. 29 — is Leap Day. The calendar oddity means this year is actually 366 days long, instead of the regular 365. Here's why leap years occur.

However, 2000 was a leap year, because it is divisible by 400. This rule was introduced by Pope Gregory XIII in 1582, when he reformed the Julian calendar that was used since 45 BCE.