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The Julian Calendar

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					  The Julian Calendar
By: Casey Gilbert
What is the Julian Calendar
    “Julian Calendar n : the solar calendar
     introduced in Rome in 46 b.c. by Julius
     Caesar and slightly modified by Augustus,
     establishing the 12-month year of 365 days
     with each 4th year having 366 days and the
     months having 31 or 30 days except for
     February.”
What is the Julian Calendar?



 Each day is numbered consecutively from
  January 1, 45 BC.
 A way of syncing the calendar
  months and the seasons.
Who developed the Julian Calendar?
   The Julian Calendar was originally
    developed by Julius Caesar and later
    modified by his nephew, Augustus
    Caesar.
When and Where did the Julian Calendar
Originate?

 The Julian Calendar system began in 46
  BC and continued until 1582.
 The calendar was responsible for for time-
  keeping in Rome.
Why was the Julian Calendar
initiated?
 (Before the Julian Calendar) Political
  forces in Rome extended months to keep
  favored politicians in office.
 The government essentially controlled
  time in Rome.
 Julian Calendar helped to regain order
  and to end the abuse of time that was
  taking place in Rome.
Why did we stop using the Julian
Calendar?
 The tropical year of the Julian Calendar is
  approximately 365 ¼, causing an error of
  1 day every 128 years
 Threw off method of calculating Easter.
       ( Average Julian year was slightly too long,
        causing Easter to fall a little earlier every
        year).
What Calendar replaced the Julian
Calendar?
   The Gregorian Calendar replaced
    the Julian Calendar in the 1500’s.
     Greece and Russia used the Julian Calendar
      until the 1900’s and the Orthodox Church in
      Russia still uses the Julian Calendar.
     “Gregorian Calendar (The Christian
      Calendar) is based on the motion of the earth
      around the sun.”
     We use the Gregorian Calendar today.
How do we calculate Julian
Calendar days?
   a = (14-month)/12
     y = year+4800-a
     m = month + 12*a - 3

 JD = day + (153*m+2)/5 + y*365 + y/4 -
  32083
 Julian Date Converter!!!!
Sources
   http://ukclipart.allinfo-about.co.uk/graphics/business/cartoon_calendar.gif
   http://www.skeptics.com.au/journal/1995/1_calendar.htm#Julian
   http://www.polysyllabic.com/Julian.html
   http://dictionary.reference.com/search?q=julian%20calendar
   http://images.google.com/images?svnum=10&hl=en&q=cartoon+clock&spell=1
   http://webexhibits.org/calendars/calendar-christian.html#SECTION00310000000000000000
   http://www.riverbluffs.org/About%20Us/Globe%20-%20Cartoon%2026.gif
   http://wwwmacho.mcmaster.ca/JAVA/JD.html

				
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posted:4/22/2010
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