Calendar


 Roman Calendar

 

 

 

 

An inscription containing the Roman calendar, which predates the Julian reform of the calendar. Observe (enlarged) that it contains the months Quintilis (5th month) and Sextilis (6th month), and allows for the insertion of an intercalary month.

 

 

The original Roman calendar is assumed to be borrowed from the culturally advanced Greeks. However, the early calendar was based on 10 months and only 304 days and there were about 61 days of winter that did not fall within the calendar. The remaining 61 days that were later discovered to have been missing, were ignored and occurred sometime during the winter season. The 10 months, beginning in modern March, were named Martius, Aprilis, Maius, Junius, Quintilis, Sextilis, September, October, November, and December. The last six of these months were derivatives from the Latin words for five, six, seven, eight, nine, and ten. According to legend, Romulus, the fist King of Rome, is supposed to have introduced this calendar in the 8th century BC.

 

  • Martius (31 days)
  • Aprilis (30 days)
  • Maius (31 days)
  • Junius (30 days)
  • Quintilis (31 days)
  • Sextilis (30 days)
  • September (30 days)
  • October (31 days)
  • November (30 days) and
  • December (30 days)

     

    Cladius Ptolemaeus:

    The ancient Roman calendar was closely linked to the science of astrology, and the teachings of Claudius Ptolemaeus. Ptolemy's work in astronomy and geography have made him famous for the ages, despite the fact that many of his theories were proven wrong or changed in the following centuries. Some of the ideas which Ptolemy presented include expressing locations by longitude and latitude, representing a spherical earth on a flat surface, and developing the first equal area map projection. Ptolemy's accomplishments reflect his understanding of spatial relationships among places on earth and of the Earth's spatial relationships to other celestial bodies. The first person to refute these theories was the Polish astronomer Nicolaus Copernicus (1473-1543) which expounded a heliocentric or 'sun-centred' 'solar-system'.Today, we still use some of Ptolemy's original theories and debate the same problems that he faced. Longitude and latitude are still used to determine precise location on Earth. 

     

     

     

     

     The Ptolemaic System

     

    The Division of the Day:

    Like us, the Romans divided each day into 24 hours, and they assigned 12 to the daytime and 12 to the night. However their timekeeping method did not run from midnight to midnight as our modern method of timekeeping does, but from sunrise to sunrise. This means that the length of the Roman hour varied according to the season, so that during the summer solstice around June 21st when the period of daylight is considerably longer than the night, the twelve hours assigned to the daytime would each have to be 1 hour and 16 minutes long. And during the short days of the winter solstice around December 21st, each daylight hour would be only 44 minutes long.

     

    There were only two days during the entire year when the Roman day contained hours of exactly 60 minutes. These dates occurred during the equinoxes,  when the length of the day is exactly equal to that of the night. The vernal equinox occurred every year around March 21st, and the autumnal equinox occured around September 21st.

     

     

     

     

     

     

    Work Cited:

     

    http://www.therthdimension.org/AncientRome/Calendar/calendar.html

     

    http://www.answers.com/topic/roman-calendar

     

    http://www.crystalinks.com/romecalendar.html

     

    http://en.wikipedia.org/wiki/Roman_calendar