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650| 200–700 | Central America [statistics and demography] | The Zapotec site of Monte Albán in Central America is at its peak in this period. It may have had 30,000 or more inhabitants. It is the centre of a complex of public buildings, temples, and dwellings that cover 40 sq km/15 sq mi. | | 598–665 | [maths] | Indian mathematician and astronomer Brahmagupta uses negative numbers in mathematics, and introduces a method of approximation for calculating the sines of small angles. | | 630–668 | India [law and government] | During the reign of Narasimhavarman I, the Pallava dynasty is the dominant power of southern India. After his death, the Pallava kingdom comes under pressure from the Chalukyas and goes into decline, disappearing about 900. | | c. 650 | China, Tang Empire [technology] | The Chinese invent the horse collar, which enables the animal to pull from the shoulders without restricting its wind-pipe, leading to great improvements in transport and agriculture. |
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