A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Robert VanderPol II
Date: 2021 Oct 27, 06:28 -0700
Time steps means it is an iterative method, you can't calculate all the positions and velocities for an arbitrary time without calculating all the intervening time steps from now until then or from a known start point until then.
How long the steps are compared to the total elapsed time considered, the relative masses and the obital periods of the other involved bodies is significant. With 350 bodies the computational load it probably pretty high and requires periodic error checks, yearly, every decade, every century, every millenia, will depend on the body.
For the navigationally important bodies they can all be treated as 2 body problems for periods of decades before errors become important, except maybe Mercury.
From: Dave Walden
Date: 2021 Oct 27, 04:37 -0700