I get a lot of questions about the planetarium. Therefore in an effort to help answer those, I've made a post of FAQs over on my professional blog.
Take a look at the following link and see if I've answered your burning question: http://triscicurious.blogspot.com/2013/07/cardboard-planetarium.html
If there are other questions that you have about the process, building, etc. drop a comment and I'll add it to the post.
Happy viewing!
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