two_body_ode_test, a Fortran90 code which calls two_body_ode(), which simulates a planar two body problem, writing graphics files for processing by gnuplot().
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two_body_ode, a Fortran90 code which simulates a planar two body problem, writing graphics files for processing by gnuplot().
INITIAL_ORBIT starts the problem, and runs it for just two orbits.
ORBITAL_DECAY runs the problem for 20 orbits.