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
Illustrated Encyclopedia of Astronomy
Empire of the Sun: Planets & Moons of the Solar System
Universe (5th Edition)
The New Solar System (Fifth Edition)
Guide to the Sun
Note: the details are on each respective page
<< Websites >>
The Solar and Heliospheric Observatory
NASA/Marshall Solar Physics
And all those who have helped us but whose name we do not know.