Everything in the space is moving all the time.

Do the orbit of major Solar Systems planets, Mercury to Saturn change? Just like Moon's orbit around Earth changes. How often, how small or big is the change? Where can I find data on this?

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    $\begingroup$ Mercury's perihelion precesses greatly over relatively short timescales. $\endgroup$
    – WarpPrime
    Commented Feb 7, 2021 at 23:26
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    $\begingroup$ Uranus and Neptune feel slighted by being left out of your list of major solar system planets. Both are much more massive than the Earth. $\endgroup$ Commented Feb 8, 2021 at 14:11
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    $\begingroup$ Highly related, if not a duplicate, Advancement of perihelion, data. $\endgroup$ Commented Feb 8, 2021 at 14:13
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    $\begingroup$ @fasterthanlight Mercury's perihelion precession is ~532 arc-seconds per century, i.e., it takes ~676 years to precess by 1°. That's not very fast. ;) In contrast, the Moon's apsidal precession period is only 8.85 years, i.e., ~9 days per degree. $\endgroup$
    – PM 2Ring
    Commented Feb 8, 2021 at 15:16
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    $\begingroup$ I'm not sure this is a good question for stack exchange because, other than "yes orbits change, but for the most part slowly and often cyclically", for any detail, this would be more like a chapter in a textbook on orbital mechanics rather than a stack exchange answer. Is there a specific orbital movement you're asking about? $\endgroup$
    – userLTK
    Commented Feb 9, 2021 at 23:29


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