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Government documents admit "nonrotating flat earth"

NASA

Top secret NASA documents in English language

https://www.nasa.gov/centers/johnson/news/!newedocs.html

• December 1987: User's Manual for LINEAR, a FORTRAN Program to Derive Linear Aircraft Models
  • Page 12: aircraft flying in a stationary atmosphere over flat nonrotating earth
  • Page 108: aircraft flying over flat, nonrotating earth
• August 1988: Derivation and Definition of a Linear Aircraft Model
  • Page 6/summary: flying over a flat, nonrotating earth.
  • Page 35/30: flying in a stationary atmosphere over a flat, nonrotating earth
  • Page 102/last page: flying over a flat, nonrotating earth.
• December 1991: An Aircraft Model for the AIAA Controls Design Challenge
  • Page 11: The nonlinear equations of motion used in this model are general six-degree-of-freedom equations representing the flight dynamics of a rigid aircraft flying in a stationary atmosphere over a flat nonrotating earth
• June 1997: Predicted Performance of a Thrust-Enhanced SR-71 Aircraft with an External Payload
  • Page 8: nonrotating Earth
• June 2002: Stability and Control Estimation Flight Test Results for the SR-71 Aircraft With Externally Mounted Experiments
  • Page 19: These equations assume a rigid vehicle and a flat, nonrotating Earth.
• April 1965: ATMOSPHERIC OSCILLATIONS
  • Page 13: A model frequently used is that of a flat, nonrotating earth.
• June 1971: A METHOD FOR REDUCING THE SENSITIVITY OF OPTIMAL NONLINEAR SYSTEMS TO PARAMETER UNCERTAINTY
  • Page 14: (2) A flat, nonrotating earth
• March 1972: DETERMINATION OF ANGLES OF ATTACK AND SIDESLIP FROM RADAR DATA AND A ROLL-STABILIZED PLATFORM
  • Page 2: The method is limited, however, to application where a flat, nonrotating earth
• December 1978: Investigation of Aircraft Landing in Variable Wind Fields
  • Page 14: a) The earth is flat and non-rotating.
• A Mathematical Model of the CH-53 Helicopter
  • Page 17: The helicopter equations of motion are given in body axes with rerpect to a flat, nonrotating Earth.
• May 1988: Flight Testing a V/STOL Aircraft to Identify a Full-Envelope Aerodynamic Model
  • Page 9: For aircraft problems, the state and measurement models together represent the kinematics of a rigid body for describing motion over a flat, nonrotating Earth
• 1988: Derivation and Definition of a Linear Aircraft Model
• 1988: User’s Manual for Interactive LINEAR, a FORTRAN Program To Derive Linear Aircraft Models
  • Page 119: The nonlinear equations of motion used are six-degree-of-freedom equations sith stationary atmosphere and flat, nonrotating earth
• 1993: Approximate Optimal Guidance for the Advanced Launch System
  • Page 1: On page one this document does mention a spherical rotating earth but then states that “...these schemes” (based on a spherical rotating earth) 1) “...are difficult to prove” and 2) “...not suggested to be used as a basis for an online real-time guidance law.
  • Page 32: Lastly, the equations of motion for the zeroth-order problem of flight in a vacuum over a flat Earth are presented.
• April 1961: CALCULATION OF WIND COMPENSATION FOR LAUNCHING OF UNGUIDED ROCKETS
  • Page 8: the missile position in space is computed relative to a flat nonrotating earth.
• Singular Arc Time-Optimal Climb Trajectory of Aircraft in a Two-Dimensional Wind Field
  • Page 2: In our minimum time-to-climb problem, the aircraft is modeled as a point mass and the flight trajectory is strictly confined in a vertical plane on a non-rotating, flat earth.
• General Equations of Motion for a Damaged Asymmetric Aircraft
  • Page 2: In this paper, the rigid body equations of motion over a flat non-rotating earth are developed...
• July 2001: Future Strategic Issues/Future Warfare [Circa 2025]