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ABOUT THE AUTHOR As an engineer before retirement, the last assignment that Mr. Sanctuary had was the responsibility for simulating the F-16 airplane (six degrees of freedom), even before first flight. Using this simulation, he worked with the test pilots to design the fly-by-wire flight control system. His experience as a former pilot in the Navy was helpful. The F-16 was far more complex to simulate than the solar system with just three degrees of freedom. Mr. Sanctuary trusts in Newtonian mechanics (using numerical integration), even for the calculation of comet or asteroid orbits interacting with the planets in the solar system, utilizing observational data supplied by the Minor Planet Center.
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