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en.wikipedia.org/wiki/History_of_calendars

The first calendars based on Zoroastrian cosmology appeared in the later Achaemenid period (650 to 330 BCE). They evolved over the centuries, but month names changed little until now. The unified Achaemenid Empire required a distinctive Iranian calendar, and one was devised in Egyptian tradition, with 12 months of 30 days, each dedicated to a yazata (Eyzad), and four divisions resembling the ...

www.reference.com/science/invented-first-calendar-f4255d5095d8fd98

Evidence indicates that the first calendar was created by the Stone Age people in Britain about 10,000 years ago. The earliest known calendar was a lunar calendar, which tracked the cycles of the moon. According to National Public Radio, the first calendar consisted of 12 pits with large rocks that mimicked the lunar cycles.

www.historyworld.net/wrldhis/PlainTextHistories.asp?ParagraphID=bvt

HISTORY OF THE CALENDAR Astral themes Days, months ... So probably is the first Egyptian calendar. And a lunar calendar is still in use today in Islam. But such a calendar has one major disadvantage. The length of a lunar month, from one new moon to the next, is 29.5 days. So twelve lunar months are 354 days, approximately 11 days short of a ...

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

How Was The Calendar Invented? ... It was supposed to be celebrated on the Sunday after the first full moon after the spring equinox, or March 21st. But as it slipped later and later each year ...

www.independent.co.uk/news/science/archaeology/news/found-after-10000-years...

Created by Stone Age Britons some 10,000 years ago, archaeologists believe that the complex of pits was designed to represent the months of the year and the lunar phases of the month.

phys.org/news/2013-07-world-oldest-calendar.html

British archaeology experts have discovered what they believe to be the world's oldest 'calendar', created by hunter-gatherer societies and dating back to around 8,000 BC.

www.whoinventedfirst.com/who-invented-the-calendar

The calendar is one of our first and most basic tools for measuring time. The first thing that must have struck our early ancestors are the repeating cycles of time evident in living on a planet. The repetitions of day and night are the most obvious.

www.infoplease.com/calendar-holidays/calendars/history-calendar

The purpose of the calendar is to reckon past or future time, to show how many days until a certain event takes place—the harvest or a religious festival—or how long since something important happened. The earliest calendars must have been strongly influenced by the geographical location of the people who made them. In colder countries, the ...

www.whoinventedit.net/who-invented-the-calendar-we-have-today.html

The modern calendar is the Gregorian calendar. It was invented by Italian astronomer and doctor Alosyius Lilius. Pope Gregory XIII approved it to reform the Julian calendar.

www.answers.com/Q/Who_invented_the_first_calendar

Nobody knows who invented the first calendar because there are different calendars: the first calendar form appeared 20,500 BC, and probably was the lunar calendar. Asked in History of Asia , Calendar