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en.wikipedia.org/wiki/History_of_calendars

Etymology. The term calendar itself is taken from the calends, the term for the first day of the month in the Roman calendar, related to the verb calare "to call out", referring to the calling or the announcement that the new moon was just seen. Latin calendarium meant "account book, register", as accounts were settled and debts were collected on the calends of each month.

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.answers.com/Q/Who_invented_the_first_calendar

Historians do not know who or when mankind invented the first calendar, probably early man when he first carved a notch into a stick or a bone which marked the passing of each full moon.

www.history.com/news/6-things-you-may-not-know-about-the-gregorian-calendar

6. Before the Gregorian calendar’s adoption, the English new year began on March 25, or Lady Day. Julius Caesar’s calendar reform of 46 B.C. instituted January 1 as the first of the year.

en.wikipedia.org/wiki/Gregorian_calendar

The Gregorian calendar is the calendar used in most of the world. It is named after Pope Gregory XIII, who introduced it in October 1582.. The calendar spaces leap years to make the average year 365.2425 days long, approximating the 365.2422-day tropical year that is determined by the Earth's revolution around the Sun. The rule for leap years is: Every year that is exactly divisible by four is...

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

Cyclical and linear concepts combine in the calendar. Heavenly Objects. The first calendars were almost all based on the cycles of the Moon. Often calendars were created locally, city by city, based on eye witness observation of the phases of the Moon. Each complete cycle became a month.

www.quora.com/Who-invented-the-calendar

According to National Public Radio, the first calendar consisted of 12 pits with large rocks that mimicked the lunar cycles. The creators of the calendar were hunter-gatherers who used the calendar to keep abreast of when certain animals migrated ...

www.enotes.com/homework-help/who-invented-first-calender-109319

The question of who invented the first calendar is very hard to answer -- no one knows for sure. Many ancient societies had them. The Egyptians are, however, credited with the first solar calendar ...

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.