In projection on Table plane, for each Star facet:
Find the most distant point belong to the Star 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.