SEVEN PARALLEL - Parallel Histories Across Seven Continents Over Ages
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Milestone Name: Muslims begun using zero in equations,

Zero was invented
Full name of milestone: Muslims begun using zero in equations
Type of milestone: science
Hindu-Arabic Numerals
0000-00-00
Milestone year: 814
Description: Hindu Arabic Numeral, http://en.wikipedia.org/wiki/Arabic_numerals
Chinese and Indians started using the concept of zero around 300-400 BC. Around 814, the Hindu-Arab numeral was invented by a Persian scientist, al-Khw¨¡rizm¨©.
Webline: http://en.wikipedia.org/wiki/0_%28number%29 Country then: Persia
Country now: Iran
Related Era: Middle Ages

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Found following people by country name matching: Iran

Found following era name by country matching: Iran

Elam -2700 -539
Median Empire -678 -594
New Babylonian Empire -626 -539
Achaemenid Empire -550 -336
Seleucid Empire -312 -63
Parthian Empire -247 224
Sassanid Empire 224 651

Found following event by country matching: Iran

Found following milestone by country matching: Iran

Zero was invented 814 Persia