May 10 is the 130th day of the year (131st in leap years) in the Gregorian calendar; 235 days remain until the end of the year. == Events == === Pre-1600 === 28 BC – A sunspot is observed by Han dynasty astronomers during the reign of Emperor Cheng of Han, one of the earliest dated sunspot observations in China.
May 10 is the 130th day of the year (131st in leap years) in the Gregorian calendar; 235 days remain until the end of the year. == Events == === Pre-1600 === 28 BC – A sunspot is observed by Han dynasty astronomers during the reign of Emperor Cheng of Han, one of the earliest dated sunspot observations in China.
Source: Wikipedia "May 10" · CC BY-SA 4.0
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