According to the timeline of future astronomical events on Wikipedia, a transit of Uranus from Neptune is the rarest planetary transit. But I want to know if there are more rare transits, including simultaneous transits seen from any planet (not just Earth).
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1$\begingroup$ Venus transits are pretty rare: exploratorium.edu/media-series/rarest-eclipse-transit-venus $\endgroup$– Nilay GhoshCommented Sep 3 at 4:09
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$\begingroup$ I'd say Pluto seen from Sedna, since they have different ecliptic plane $\endgroup$– JuanCaCommented Sep 3 at 19:57
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1$\begingroup$ @JuanCa: There is only one ecliptic plane, and that is that of the Earth around the Sun. Other bodies have different orbital planes. And the Pluto–Sedna couple is no different from others in that respect, because any two random bodies in the Solar System will have different orbital planes—sometimes slightly different (e.g., the eight planets), sometimes very different. $\endgroup$– Pierre PaquetteCommented Sep 4 at 1:53
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$\begingroup$ FWIW, planetary occultation are also pretty rare. Saturn occultation to Jupiter is one of the rarest events known with the next occurrence on February 10, 7541. This event is visible worldwide since the duo would be positioned almost in opposition to the sun, in the border line between the constellations of Orion and Taurus. The last one occurred in 6857 B.C.E $\endgroup$– Nilay GhoshCommented Sep 7 at 5:15
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