Geometry of the sun gear is calculated. For calculation the following initial data must be provided:
From the initial data several results can be derived. Formula flow
describes calculaton of intermediate results as well as calculation of
the final results.
Transverse module
Transverse presure angle
Pinion facewidth
Reference centre distance
Working transverse pressure angle
Sum of addendum modification coefficients 
where
Sum of addendum modification coefficients 
Addendum modification coefficients
Reference diameter of the sun and planet
Root diameter of the sun and planet
Tooth depth
Tip diameter of the sun and planet
Base diameter of the sun and planet
Transverse contact ratio
Length of path of contact
Transverse pitch on path of contact
Overlap ratio
Total contact ratio
Diameter of V-circle of the sun and planet
Transverse pressure angle on V-circle on the sun an planet
Base helix angle
Number of teeth of the sun and planet in a span
Base tangent length ot he sun and planet for 
teeth
