Without information from various helpful sources, our project would never have been successfully done. We would like to thank The Inter-SOL Programme for giving advice on sunspot observations, as well as acknowledge the following sources for their information and other various materials. We will also like to express our sincere gratitude to the Astronomy Club of Ngee Ann Polytechnic for their help in doing the sunspot observations. << Book references >> Discoveries and Opinions of Galileo (1st Publication) :: Page 80 - 145 (Translated with an Introduction and Notes by Stillman Drake) An Anchor Book, Published by Doubleday Illustrated Encyclopedia of Astronomy Empire of the Sun: Planets & Moons of the Solar System By John Gribbins & Simon Goodwin Published by Constable and Co. Ltd Universe (5th Edition) By William J.Karfmarn III, Roger A.Freedom Published by W.H. Freeman & COD The New Solar System (Fifth Edition) By J.Kelly Beatty, Carolyn Collins Peterson, Andrew Chaikin Published by Cambridge University press Guide to the Sun By Kenneth J.H.Philips Published by Cambridge University Press Note: the details are on each respective page << Websites >> The Solar and Heliospheric Observatory (Especially Terry who granted us permission to use the pics and info on the website.) Laboratory for Astronomy and Solar Physics: Solar Flare Theory (by NASA/Goddard Space Flight Center) NASA/Marshall Solar Physics (Thanks to Dr. David H. Hathaway for granting us permission to use his info and pics.) SpaceWeather.com Astronomy 161: The Solar System Oulu Space Physics Textbook The Galileo Project Exploratorium Sunspots & Activist Strategy And all those who have helped us but whose name we do not know.