A calendar is a system of organizing days for social, religious, commercial, or administrative purposes. The Gregorian calendar is the most widely used calendar in the world today. It is a solar calendar, meaning that it is based on the Earth’s orbit around the Sun. The Gregorian calendar has 12 months, each with a different number of days. January, February, and March are the first three months of the year. They have 31, 28, and 31 days, respectively.
The Gregorian calendar was introduced in 1582 by Pope Gregory XIII. It was a modification of the Julian calendar, which had been in use since 46 BC. The Julian calendar had a leap year every four years, but this caused the calendar to drift out of sync with the Sun’s orbit. The Gregorian calendar introduced a more accurate leap year rule, which helped to keep the calendar in sync with the Sun.
