The Julian calendar adjusted for the fact that Earth's year was not exactly 365 days by adding a day every fourth year.

Name: The Julian calendar adjusted for the fact that Earth's year was not exactly 365 days by adding a day every fourth year.
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The Julian calendar introduced the concept of leap year, which added an extra day every fourth year to adjust for the fact that Earth's year is approximately 365.25 days long.

The Julian Calendar Adjusted for the Fact That Earth's Year