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fNBookForm2 prints a number in Textbook Form with powers abbreviations in place of exponents (default). Output is a compressed dressed form textbooks use for significant figures tables. Easy, quality, comprehensive. booknum reads such.
an important aspect is that the result maintains both accuracy and precision and has rounding control. doing this sometimees requires careful planning (error-prone complicated conversions).
can read them back from textbook (into Mathematica)...
This is for Mathematica.
1) list of geocentric <> geodetic <> XYZ related equations*
2) quick plots using them (3d poly globe)
3) wikipedia article summarizing the above
4) one equation is by author of this paper. shows that using (new) geometry observation, Heiskanen and Moritz or Ferrari equations were not necessary as the problem is not inheirently recursive as they suggested. (see article)
*gleened from many onlne sources. file geodetic-geodesic is same, improperly named)
(for historic reasons files are also in https://sourceforge.net/projects/periodictablemm/)