What was the main reason for introducing the Gregorian calendar?

• To correct inaccuracies in the Julian calendar

• To align with the Islamic calendar

• To introduce a new cultural system

• To synchronize with the Chinese calendar

Which calendar system is lunar-based?

• Islamic calendar

• Gregorian calendar

• Hebrew calendar

• Julian calendar

How often does a leap year occur in the Gregorian calendar?

• Every four years

• Every three years

• Every five years

• Every six years

What is a unique feature of the Chinese calendar regarding leap years?

• It occasionally adds a leap month

• It adds an extra day in February

• It skips a leap year every 100 years

• It follows the solar year strictly

Why are leap years included in many calendar systems?

• To keep the calendar year synchronized with the astronomical year

• To introduce new cultural practices

• To align with religious events

• To mark historical events