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http://www.oocities.org/CapeCanaveral/Hangar/6580/webdoc1.htm

http://www-groups.dcs.st-and.ac.uk/~history/Mathematicians/Kepler.html

http://es.rice.edu/ES/humsoc/Galileo/People/kepler.html

http://www.nada.kth.se/~fred/tycho/index.html

http://es.rice.edu/ES/humsoc/Galileo/People/tycho_brahe.html

http://www.phys.virginia.edu/classes/109N/1995/lectures/tychob.html

http://www.twingroves.district96.k12.il.us/Renaissance/University/Galileo/Galileo.html

http://www.astro.uni-bonn.de/~pbrosche/persons/pers_galilei.html

http://www-groups.dcs.st-and.ac.uk/~history/Mathematicians/Galileo.html

http://www.maths.tcd.ie/pub/HistMath/People/Newton/RouseBall/RB_Newton.html

http://galileoandeinstein.physics.virginia.edu/lectures/newton.html

http://www.newtonproject.sussex.ac.uk/prism.php?id=1

http://www.treasure-troves.com/bios/Newton.html

Excerpts of the "Principia"

Newton and the history of mathematics