You can visit these websites for more information.
Title: Ptolemy
Author: Matt Rosenberg
Address:http://geography.about.com/od/historyofgeography/a/ptolemy.htm
Title: Geocentric Model
Author: Abby Cessna
Address: http://www.universetoday.com/32607/
Title: Heliocentric Model
Author: Abby Cessna
Address: http://www.universetoday.com/33113/heliocentric-model/
Title: Galileo Galilei
Author: Mary Bellis
Address:http://inventors.about.com/od/gstartinventors/a/Galileo_Galilei.htm
Title: History of the Microscope
Author: Unknown
Address: http://www.microscopemaster.com/history-of-the-microscope.html
Title: Kepler's Three Laws
Author: Unknown
Address: http://www.physicsclassroom.com/class/circles/u6l4a.cfm
Title: Johannes Kepler Biography
Author: Nola Taylor Redd
Address: http://www.space.com/15787-johannes-kepler.html
Author: Matt Rosenberg
Address:http://geography.about.com/od/historyofgeography/a/ptolemy.htm
Title: Geocentric Model
Author: Abby Cessna
Address: http://www.universetoday.com/32607/
Title: Heliocentric Model
Author: Abby Cessna
Address: http://www.universetoday.com/33113/heliocentric-model/
Title: Galileo Galilei
Author: Mary Bellis
Address:http://inventors.about.com/od/gstartinventors/a/Galileo_Galilei.htm
Title: History of the Microscope
Author: Unknown
Address: http://www.microscopemaster.com/history-of-the-microscope.html
Title: Kepler's Three Laws
Author: Unknown
Address: http://www.physicsclassroom.com/class/circles/u6l4a.cfm
Title: Johannes Kepler Biography
Author: Nola Taylor Redd
Address: http://www.space.com/15787-johannes-kepler.html