In projection on XY plane, for each Star facet:

• Find the most distant point belong to the Start facet from line between Star and Table facets. Call it "A".
• Find the most distant point from this line on the girdle (in the same half-plane). Call it "B"
• StarUpperRatio is A/B.

This most consistent case for this algorithm is "F:E" shown on picture above. Please pay attention that segments measured above do not belong to the same line in all cases.