Lego Orrery

 
 
 
 
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This is an orrery I made to help explain to my children why we have so much light in the summer and not nearly enough in the winter (we live in Alaska). No attempt was made to get relative sizes, distances, or the orbit periods correct. Rather, this model shows the inclination of the earth's axis and why it causes the seasons.  To see an accurate orrery, check out this one built by Don Rogerson