28th century BC
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|Millennium:||3rd millennium BC|
|Decades:||2790s BC 2780s BC 2770s BC 2760s BC 2750s BC
2740s BC 2730s BC 2720s BC 2710s BC 2700s BC
|Categories:||Births – Deaths
Establishments – Disestablishments
The 28th century BC is a century which lasted from the year 2800 BC to 2701 BC.
- c. 2800 BC – 2700 BC: Seated Harp Player, from Keros, Cyclades, is made. It is now at the Metropolitan Museum of Art, New York.
- 2775 BC – 2650 BC: Second Dynasty wars in Ancient Egypt.
- Around 2773 - the 365-day calendar is introduced in Egypt.
- 2750 BC: End of the Early Dynastic I Period, and the beginning of the Early Dynastic II Period in Mesopotamia.
- c. 2750 BC: Estimated ending of the Cucuteni-Trypillian culture in the region of modern-day Romania, Moldova, and southwestern Ukraine
- 2737 BC: Invention of tea as a beverage by Shennong, according to a Chinese legend.
- c. 2715 BC: Old Kingdom starts in Ancient Egypt (another date is 2660 BC).
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Inventions, discoveries, introductions 
- circa 2750 BC: Construction of Silbury Hill begun.
- The Neolithic monument Stonehenge is built in England near Salisbury, Wiltshire, comprising a circular earthwork 97.5 m/320 ft in diameter with 56 small pits around the circumference (later known as the Aubrey holes). The position of the ‘heel stone’ outside the circle suggests a connection with Sun worship and observation. It is probably an astronomical observatory with religious functions; the motions of the Sun and Moon are followed with the aid of carefully aligned rocks. source:
- According to Herodotus, somewhere around 2750 BC, the city of Tyre was founded.
Decades and years 
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