NPR

The decimal point was in use 150 years before previously thought, research shows

NPR's Scott Simon talks to math historian Glen Van Brummelen about his finding that the decimal point appeared in the 1440s, earlier than thought. How did the decimal point come to be? - the dot that ...
Smithsonian Magazine

The Decimal Point Is 150 Years Older Than Previously Thought, Medieval Manuscript Reveals

Math historian Glen Van Brummelen came across decimal points in Giovanni Bianchini's manuscript, Tabulae primi mobilis B. Van Brummelen / Historia Mathematica, 2024 For years, historians thought ...
Scientific American

The Decimal Point Is 150 Years Older than Historians Thought

The decimal point was invented around 150 years earlier than previously thought, according to an analysis of astronomical tables compiled by the Italian merchant and mathematician Giovanni Bianchini ...
Live Science

World's oldest known decimal point discovered in merchant's notes from 1440s Italy

Decimal points are at least 150 years older than historians thought, according to newly unearthed notes from Venetian merchant Giovanni Bianchini, who practiced astrology in the 1440s. When you ...