Degenerate Conic

The Brouwer-Lyddane elements are a set of "mean elements" used to describe the orbit of a spacecraft. Mean elements (as opposed to osculating elements) are used as a way to smooth out fluctuations of an orbit due to the zonal spherical harmonic terms. There are two flavors: short period (considering only J2) and long…

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A modern Fortran scientific programming ecosystem

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Historically, large general-purpose libraries have formed the core of the Fortran scientific ecosystem (e.g., SLATEC , or the various PACKS ). Unfortunately, as I have mentioned here before, these libraries were written in FORTRAN 77 (or earlier) and remained unmodified for decades. The amazing algorithms continued…