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Credits
http://www.showme.com/search/?q=rotation
http://eofdreams.com/winter.html
http://guardianlv.com/2013/09/why-do-we-h
ave-fall/
http://support.prometheanplanet.com/server.
php?show=nav.16174
http://scienceblogs.com/startswithabang/201
0/06/21/measure-the-tilt-of-the-earth/
Mybigcampus resources