IAU Rotation Models

The IAU Working Group on Cartographic Coordinates and Rotational Elements (WGCCRE) is the keeper of official models that describe the cartographic coordinates and rotational elements of planetary bodies (such as the Earth, satellites, minor planets, and comets).  Periodically, they release a report containing the coefficients

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Speeding up SPICE

The SPICE Toolkit software is an excellent package of very well-written and well-documented routines for a variety of astrodynamics applications.  It is produced by NASA’s Navigation and Ancillary Information Facility (NAIF).  Versions are available for Fortran 77, C, IDL, and Matlab. To speed up

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SPICE N65 Released

JPL just released a new version of the SPICE Toolkit (N65).  According to the What’s New page, changes include: support for some new environments and termination of some old environments new Geometry Finder (GF) interfaces — illumination angle search, phase angle search, user-defined

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