const r_sun     = 695500.0KiloMeter; export r_sun    
>     const r_jupiter =  69173.0KiloMeter; export r_jupiter
>     const r_saturn  =  57316.0KiloMeter; export r_saturn 
>

....

I have a semi-related question.  Why this way?  Why not read these values 
from a database
at startup or at least a file of HDF5 or JSON. Do you find yourself 
cutting-and pasting
constants all over the place?  

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