introduction of the FIBONACCI SERIES, which is explained in
the book as “A certain man put a pair of rabbits in a place
surrounded on all sides by a wall. How many pairs of rabbits
can be produced from that pair in a year if it is supposed that
every month each pair begets a new pair which from the
second month on becomes productive?”1220 lMathematician JOHN DE HOLYWOODwrites Tractatus de
Spheraas an astronomy text, and it is used as the basic text
on the subject for the next four centuries.1232 lJohn de Holywood writes the book De Anni Rationeon the
study of time and the calendar, and states that the way to
correct the Julian calendar is to remove one day from the
calendar every 288 years.1406 lJacopo Angeli da Scarperia translates Ptolemy’s Geography
into Latin. Within the next 40 years, owning a copy of this
book, with its beautiful illustrations, becomes a status
symbol among the wealthy.1450 lJohannes Gutenberg develops the first commercial printing
press, marking the beginning of the end of handwritten
books, and making it possible for the masses to acquire
knowledge at an affordable price.1463 lREGIOMONTANUScowrites a book with Georg Peurbach
entitled the Epitome of the Almagest,and it becomes a
leading text for scholars of astronomy for the next 150 years.1482 lEuclid’s book, The Elements,is published for the first time.
It will become the most translated and published textbook of
all time, going through more than 1,000 editions.1494 lLUCAS PACIOLIpublishes a 600-page summary of
mathematics, Summa de Arithmetica, Geometria,
Proportioni et Proportionalita,which covers everything
known about the topic at the time, and is considered the first
printed book on all of these subjects.1497 lPacioli starts work on his second book, Divina Proportione,
with the help of his friend Leonardo da Vinci as illustrator,CHRONOLOGY 1220 – 1497
CHRONOLOGY 1220 – 1497