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This article is about the year 900. For the number, see 900 (number). For the skateboarding trick, see 900 (skateboarding). For series, see 900 series.
Millennium: 1st millennium
Centuries: 8th century9th century10th century
Decades: 870s  880s  890s  – 900s –  910s  920s  930s
Years: 897 898 899900901 902 903
900 by topic
State leadersSovereign states
Birth and death categories
Establishment and disestablishment categories

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The eastern hemisphere in 900

Year 900 (CM) was a leap year starting on Tuesday (link will display the full calendar) of the Julian calendar.


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  • The Persian scientist Rhazes distinguishes smallpox from measles in the course of his writings. Holding against any sort of orthodoxy, particularly Aristotle's physics, he maintains "the conception of an 'absolute' time, regarded by him as a never-ending flow".




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