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I have SN4.5 and The Sky 6.
Both are excellent programs but I got the Sky for computer guiding my scope , it is better than SN4.5 for that.
The other thing about SN4.5 is you need open GL to get the best from it , some thing my Laptop does not support. It is also is fairly memory hungry where as The Sky doesn't need open Gl but still it works best with a resonable up to date CPU.
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