Thread: T2, different sizes ???
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  #9  
Old 03-02-2019, 03:01 PM
PhilTas (Phil)
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PhilTas is offline 		 
Join Date: Apr 2013
Location: Darwin
Posts: 203
this link was posted to IIS recently -

https://agenaastro.com/astronomy-threads-explained.html

I've found it very informative.

cheers Phil
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