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Katherine Johnson's publications at TDRS

@astVintageSpace A great post or video would be about the actual problems the women of @HiddenFigures were solving and the methods they used
"NF-104 on a zero-G trajectory through the thin atmosphere at the edge of space for about 80 seconds."

Project Apollo Reentry Simulation ~ 1965 NASA; How Atmospheric Re-entry Was Simulated in the 1960s - YouTube

iSat: Interactive Satellite Viewer
Is a cool viewer. Zoom in to get a 4 space sense of the ISS orbit above earth.

"vernier engine throttle settings were controlled using a proportional-plus-derivative
feedback loop closed around the measured vs. desired velocity magnitude as
a function of altitude, represented by the [~parabolic] descent contour"
Surveyor Spacecraft Automatic Landing System
Sam W. Thurman
AAS 04-062
Fifty Years of Orbit Determination: Development of Modern Astrodynamics Methods
Jerome R. Vetter

.@DS_COVR Why no 10 & 11 November EPIC images? New ?