It's a known fact that the point all bodies in the solar system orbit around is not actually the centre of the sun, but some point close to the sun, known as th

It's a known fact that the point all bodies in the solar system orbit around is not actually the centre of the sun, but some point close to the sun, known as the barycentre of the solar system[0]. This moves around based on the exact configuration of the planets (where they are in their orbits).[1] By definition, this barycentre can only be considered 'locally'. For example, there is another 'barycentre' for the whole milky way, and presumably for the whole universe. Mercury is the 'closest' to all planets on average over time due to the fact it is closest to the sun (or more accurately, this barycentre), and due to an unintuitive but completely logical consequence of Mercury having a small orbit[2]. The last paragraph of your comment I was not able to properly understand. It is certainly true that the 'solar system' is made up of objects which rotate around the sun. But that's the definition of 'solar system'. Just as the 'milky way' is made up of objects which rotate together... including the solar system. It's just useful for us to have a term for our local corner of the universe. [0]: https://www.skymarvels.com/gallery/Vid%20-%20Solar%20System%20Barycenter.htm https://www.skymarvels.com/gallery/Vid%20-%20Solar%20System%... [1]: Satellites (both natural and artificial) also orbit this point when you map their path over the course of a full orbit of the body they primarily orbit: e.g. the moon orbits the Earth, but over the course of a year, the moon and Earth together orbit the barycentre of the solar system. [2]: This GIF shows it quite logically: https://engaging-data.com/pages/scripts/orbits/mercury-faster.gif https://engaging-data.com/pages/scripts/orbits/mercury-faste...