对火星轨道变化问题的最后解释
r numerical error in the total angular momentum, which should be rigorously preserved up to machine-e precision.
2.4.2 error in planetary longitudes
since the symplectic maps preserve total energy and total angular momentum of n-body dynamical systems inherently well, the degree of their preservation may not be a good measure of the accuracy of numerical integrations, especially as a measure of the positional error of planets, i.e. the error in planetary longitudes. to estimate the
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