When do all the planets line up?

Alignments of the fast-moving inner planets can occur as regularly as every few months or so, while groupings of the slower outer planets -- Jupiter, Saturn, Uranus, and Neptune -- occur far less often, but last longer when they do. read more

The planets in our solar system never line up in one perfectly straight line. If you look at a two-dimensional plot of the planets and their orbits on a piece of paper you may be lead to believe that all the planets will circle around to the same line eventually. In reality, the planets do not all orbit perfectly in the same plane. read more

Universe Today estimates that all planets in Earth's solar system line up in the same quadrant about once every 200 years. NASA also adds that precise planetary alignment, where all planets align exactly, has probably never happened. read more