Submitted URL is a newsletter linking to a Nature blurb linking to the actual paper, <a href="https://doi.org/10.1016/j.hm.2024.01.001" rel="nofollow">https://doi.org/10.1016/j.hm.2024.01.001</a> "Decimal fractional numeration and the decimal point in 15th-century Italy" (Glen Van Brummelen, 2024). That paper's abstract:<p>"The earliest known appearance of the decimal point was in the interpolation column of a sine table in Christopher Clavius's Astrolabium (1593) [...] We trace Clavius's use of decimal fractional numeration and the decimal point back to the work of Giovanni Bianchini (1440s), whose decimal system was a distinguishing feature of his calculations in spherical astronomy and metrology."