Gregorian calendar explained to kids

The Gregorian calendar is the most widely used calendar in the world today. It is named after Pope Gregory XIII, who introduced it in 1582. The Gregorian calendar is a solar calendar, which means it is based on the position of the Sun in the sky. It has 365 days in a year, with a leap year every four years. This means that, on average, the Gregorian calendar is 365.2425 days long. The Gregorian calendar is the successor to the Julian calendar, which was introduced by Julius Caesar in 45 BCE. The Julian calendar was based on the lunar cycle, with each month beginning on the new moon. This meant that the calendar was only 354 days long, with an extra month (known as a leap month) added every two or three years to keep it in line with the seasons. The Gregorian calendar was introduced to correct this discrepancy. It is based on a more accurate estimate of the length of the solar year, and it also includes a provision for leap years. As a result, the Gregorian calendar is 365.2425 days long. The Gregorian calendar is used by most countries in the world today. However, some countries, such as China and Japan, still use the older Julian calendar for some purposes.