Matt Fraction | Dewey Decimal Classification | Yosemite Decimal System | Decimal Day | Binary-coded decimal | Universal Decimal Classification | Propellant mass fraction | Penny (British pre-decimal coin) | Payload fraction | Mass fraction | decimal day |
The first known approximation of the (inverse) golden ratio by a decimal fraction, stated as "about 0.6180340", was written in 1597 by Michael Maestlin of the University of Tübingen in a letter to his former student Johannes Kepler.