Common year
In the Gregorian calendar, 303 out of every 400 years are common years. In the Julian calendar, 300 out of every 400 years were common years. All the other years are special and known as leap years. In common years, February has exactly four weeks, so March begins on the same day of the week. November also begins on this day. For example, February 2023 began on a Wednesday, so March began on a Wednesday as well. November follows the same characteristic.