By John Sanidopoulos
September is derived from the Latin septem, which means "seven", because originally it was the seventh of ten months on the oldest known Roman calendar, with March being the first month of the year until perhaps as late as 153 BC. After the calendar reform that added January and February to the beginning of the year, September became the ninth month, but retained its name. It had 29 days until the Julian reform, which added a day. Thus today the month of September contains 30 days. The September equinox also takes place in this month, and certain observances are organized around it. It is the Autumn equinox in the Northern Hemisphere, and the Vernal Equinox in the Southern Hemisphere; the dates can vary from 21 September to 24 September.
