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This eliminates leap years periodically in order to keep the calendar more synchronized with the solar year.

The Gregorian calendar was named after Pope Gregory XIII who officially approved it in 1582 A.

the most commonly used calendar system in the world today.

It is based on the older Julian calendar of the late Roman Empire but more accurately corresponds to the solar year of 365.2422 days. This is inaccurate by approximately 11 minutes a year.

The Gregorian calendar fixed this problem by changing the rules for leap years.

If two bones from the same site have markedly different amounts of nitrogen and fluorine, it is a strong indication that they did not come from the same time period.