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    • https://phys.libretexts.org/Bookshelves/Astronomy__Cosmology/Celestial_Mechanics_(Tatum)/13%3A_Calculation_of_Orbital_Elements/13.12%3A_Sector-Triangle_Ratio
      I now make use of the sum of the sum-and-difference formulas from page 38 of chapter 3, namely cosAcosB=12(cosS+cosD) and sinAsinB=12(cosDcosS),...I now make use of the sum of the sum-and-difference formulas from page 38 of chapter 3, namely cosAcosB=12(cosS+cosD) and sinAsinB=12(cosDcosS), to obtain In these Equations we already know an approximate value for f3 (we’ll see how when we resume our numerical example); the unknowns in these Equations are R3, a and g3, and it is R3 that we are trying to find.

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