How Often Do All 8 Planets Align 2025 Solar Eclipse. The chance that mars, jupiter, saturn, uranus, and neptune will all be within this arc as well on any given pass. All seven of the solar system’s other planets will appear together in earth’s skies in a rare alignment.

So, on average, the three inner planets line up every 39.6 years. The farther a planet is from the sun, the slower it will orbit.