November (i/noʊˈvɛmbər/ noh-VEM-bər) is the eleventh month of the year in the Julian and Gregorian Calendars and one of four months with the length of 30 days. November was the ninth month of the ancient Roman calendar. November retained its name (from the Latin novem meaning "nine") when January and February were added to the Roman calendar. November is a month of spring in the Southern Hemisphere and autumn in the Northern Hemisphere. Therefore, November in the Southern Hemisphere is the seasonal equivalent of May in the Northern Hemisphere and vice versa.November starts on the same day of the week as February in common years and March every year. November ends on the same day of the week as August every year. November starts on the same day of the week as June of the previous year in common years and September and December of the previous year in leap years. November ends on the same day of the week as March and June of the previous year in common years and September of the previous year in leap years. In years immediately before common years, November starts on the same day of the week as August of the following year while in years immediately before leap years, November starts on the same day of the week as May of the following year. In years immediately before common years, November ends on the same day of week as May of the following year while in years immediately before leap years, November ends on the same day of the week as February and October of the following year.