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www.answers.com/Q/Who_invented_the_365_day_calendar

The 365 day calendar was technically first invented by the ancient Egyptians. They had a 360 day calendar that had 12 months with 3 seasons (Akhet - June 15 to October 15, Proyet - October 15 to ...

world-history-education-resources.com/articles-1/invented-365-day-calendar.html

Invented a 365-day Calendar and Rubber Balls. Egyptians Olmecs Han Kush. There are three parts to that question, yes it was Constantine that issued the Edict of Milan, but it was Egypt that invented the 365-day calendar, and the Olmec's that invented the the rubber balls by using the sap from rubber trees.

en.wikipedia.org/wiki/History_of_calendars

The history of calendars, that is, of people creating and using methods for keeping track of days and larger divisions of time, covers a practise with ancient roots.Although it is calculated by solar and lunar years as calculated there is 365.242190 days in a year ( Outstandingly accurate till today) People use calendars every day.

answersdrive.com/when-was-the-12-month-calendar-invented-3823319

The Gregorian calendar is the calendar in current use in the Western world, both as the civil and Christian ecclesiastical calendar. Instituted by Pope Gregory XIII in 1582, the calendar has 365 days with an extra day every four years (the leap year) except in years divisible by 100 but not divisible by 400.

www.answers.com/Q/When_was_the_first_365_day_calendar_invented

The 365 day calendar was technically first invented by the ancient Egyptians. They had a 360 day calendar that had 12 months with 3 seasons (Akhet - June 15 to October 15, Proyet - October 15 to ...

www.seeker.com/how-was-the-calendar-invented-1792531780.html

How Was The Calendar Invented? Have you ever wondered why we use the calendar that we use? Why are there 365 days in a year? By Seeker. Published on 1/2/2015 at 6:00 AM.

www.historyworld.net/wrldhis/PlainTextHistories.asp?historyid=ac06

Spread through the Roman empire, and later throughout Christendom, this calendar proves very effective for many centuries. Only much later does a flaw yet again appear. The reason is that the solar year is not 365 days and 6 hours but 365 days, 5 hours, 48 minutes and 46 seconds. The difference amounts to only one day in 130 years.

www.quora.com/How-did-Ancient-Egyptians-invent-the-365-day-calendar

They were an agricultural society. They also had at least three calendars used simultaneously for different purposes: Lunar, Solar, and Civic. Some have written the oldest is the Lunar Calendar that was about 354 days with 12 months with an extra ...

www.timecenter.com/articles/a-history-of-time-and-ancient-calendars

Much like the other ancient calendars, this calendar used 12 months to divide 365 days per year. The reformation process was complicated. For starters, the original Roman calendar did not include 365 days. Consequently, the Julian calendar had to compensate for this and choose a new start for each calendar year.

www.todayifoundout.com/index.php/2013/09/the-evolution-of-the-modern-day-calendar

The Evolution of the Modern Day Calendar. ... The Mayans, having concluded that there were 365 days in a year, fashioned a calendar consisting of 18 months including 20 days each. They rounded out the year by adding five days at the end which were considered to be very unlucky. Another aspect unique to the Mayan calendar is what is called the ...