NoLongerOnTheBall
Engineering Experiment Station:Atmospheric Oscillations Georgia Institute of Technology, Prepared for NASA; Atmospheric Oscillations (Page 10) ... "A model frequently used is that of a flat, nonrotating earth." ... (next paragraph) .. "The most one can profitably simplify the problem is to consider an isothermal atmosphere, plane level surface, and a nonrotating Earth." https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19650015408.pdf