1620s


The 1620s decade ran from January 1, 1620, to December 31, 1629. Contents 1 Events and trends 1.1 Major ongoing events 1.2 1620 1.3 1621 1.4 1622 1.5 1623 1.6 1624 1.7 1625 1.8 1626 1.9 1627 1.10 1628 1.11 1629 2 1620s in fiction and popular culture 3
Dialogue Concerning the Two Chief World Systems


The Dialogue Concerning the Two Chief World Systems ( Dialogo sopra i due massimi sistemi del mondo ) was a 1632 Italian language book by Galileo Galilei comparing the Copernican system with the traditional Ptolemaic system. It was translated to Latin as Systema cosmicum [ 1 ] in 1635










