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All the solar system simulations I've come across showing the positions of planets only show the positions in a certain time period, at beginning of the first millenium the earliest. There was just one exception where I could enter minus-years but it's unreliable (and in fact there never was a year 0). Do you know a simulation/planetary system map where I can learn the planet's positions before Christ? To make it clear: I mean the planet's heliocentric positions (when you look on our system from 'above' the Sun), not their location on the sky.

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  • $\begingroup$ Actually, I think that astronomers use a year numbering system with a year 0, which corresponds to 1 BC. thus 2 BC is year -1, 3 BC is year -2, and so on in the astronomical year count. $\endgroup$ – M. A. Golding Nov 12 '20 at 15:28
  • $\begingroup$ @M.A.Golding Perhaps the one simulator was trustworthy but I wonder whether there's a more reliable one that definitely is trimmed for showing the planet's positions in years BC. $\endgroup$ – John Nov 12 '20 at 15:56
  • $\begingroup$ There is a general collection of resources at Where can I find the positions of the planets, stars, moons, artificial satellites, etc. and visualize them? and I think that answers can draw from those choices. $\endgroup$ – uhoh Nov 12 '20 at 22:52
  • $\begingroup$ The AD/BC abbreviations are often replaced with CE/BCE for common era and before common era. I'm fine with either, but CE/BCE are more commonly used. That said, the AD/BC system of counting years was put in place in 525 AD and more accurate estimates have been done since then, putting Christ's birth at around 6 BC, not 1 anno Domini. There's not surprisingly, some uncertainty and disagreement on the year. religioustolerance.org/…. $\endgroup$ – userLTK Nov 13 '20 at 5:41
  • $\begingroup$ @userLTK "Common era" and such nonsense was applied in Eastern Bloc countries. 2020 is the current year of the Christian calendar. If you don't like it or don't like Christianity for some reason, use another calendar. If you don't like religion in general, use the French revolution calendar. Although the Christian calendar is not quite correct, we have the year 2020 AD, not 2026. I don't know who's responsible for changing that. $\endgroup$ – John Nov 13 '20 at 7:10

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