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  1. The 29th century BC was a century that lasted from the year 2900 BC to 2801 BC. Events The grove in which the Prometheus Tree grew, with the Wheeler Peak headwall in the distance. c. 2900 BC: Beginning of the Early Dynastic Period I in Sumer.

  2. The common Christian traditional calendar date of the birthdate of Jesus was 25 December, a date first asserted officially by Pope Julius I in 350 AD, although this claim is dubious or otherwise unfounded. The day or season has been estimated by various methods, including the description of shepherds watching over their sheep.

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    The people who likely devised the earliest calendars are thought to have been motivated by food: the need to track seasonal growth rates in plants and migrations in animals. These early astronomersmarked time by the only way possible: by learning the motions of celestial objects such as the sun, moon, and stars. These earliest calendars were develo...

    While we take it for granted today, the crucial human requirement of capturing events and predicting future events based on your observations is a truly mind-blowing problem. It seems quite likely that much of our science, mathematics, and astronomy are a direct outgrowth of our attempts to make a reliable calendar. And as scientists learn more abo...

    Fortunately, we can track the failures and successes of that process through surviving, if patchy historical documentation. The earliest Babyloniancalendar reckoned the year to be 360 days long--that's why we have 360 degrees in a circle, 60 minutes to an hour, 60 seconds to the minute. By about 2,000 years ago, societies in Egypt, Babylon, China, ...

    This glossary entry is part of the About.com Guide to Calendar Designations and the Dictionary of Archaeology. Dutka J. 1988. On the Gregorian revision of the Julian calendar. The Mathematical Intelligencer30(1):56-64. Marshack A, and D'Errico F. 1989. On Wishful Thinking and Lunar "Calendars". Current Anthropology30(4):491-500. Peters JD. 2009. Ca...

  3. As the name suggests, BC or Before Christ refers to the number of years before Christ was born. AD or Anno Domini is the period after Christ was born. BCE and CE stand for ' Before Common Era ' and ' Common Era ' and are alternatives to BC and AD respectively. Timeline showing AD and BC.

  4. The Roman calendar was the calendar used by the Roman Kingdom and Roman Republic. Although the term is primarily used for Rome's pre-Julian calendars, it is often used inclusively of the Julian calendar established by the reforms of the Dictator Julius Caesar and Emperor Augustus in the late 1st century BC.

  5. The 29th century BC is a century which was from the year 2900 BC to 2801 BC. Events. The grove in which the Prometheus Tree grew, with the Wheeler Peak headwall in the distance. c. 2900 BC – 2400 BC: Sumerian pictographs evolve into phonograms. 2900 BC – 2334 BC: Mesopotamian wars of the Early Dynastic period.

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  7. Calendar - Ancient, Religious, Systems: The lunisolar calendar, in which months are lunar but years are solar—that is, are brought into line with the course of the Sun—was used in the early civilizations of the whole Middle East, except Egypt, and in Greece. The formula was probably invented in Mesopotamia in the 3rd millennium bce. Study of cuneiform tablets found in this region ...

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