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Is there an online source where historic observational data regarding the position of the planets can be found? I was always intrigued by the fact that Neptune was mathematically predicted before it was actually observed (wiki article).

I am curios in finding more about this mathematical prediction regarding the existence of Neptune. Here are a few questions related to this:

  • Are there any detailed references on the subject?

  • Is it possible to find the data which lead to this discovery online somewhere?

  • Are there online resources regarding the position of the planets (now or at various points in the past)?

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  • $\begingroup$ astronomy.stackexchange.com/questions/13488 may or may not be helpful. The Royal Observatory in England has been publishing predicted planetary positions for something like 1000 years, but these are predicted, not observed. $\endgroup$
    – user21
    Jun 5 '19 at 18:00

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