How often do all the planets align?

One calculation of alignments within around thirty degrees (about as close as they can get) shows that the last such alignment was in 561 BC, and the next will be in 2854. The eight planets plus Pluto are somewhat aligned every 500 years, and are grouped within 30 degrees every one to three alignments. read more

Rather, all the planets come out at the same time in the evening sky, or perhaps the morning sky. Sometimes a planet can be seen in the morning sky, that is, before the sun comes up, and sometimes in the evening sky after the sun sets. Last year, in August 2008, by coincidence all five of the naked-eye planets lined up in the evening sky. read more

The nine planets in this solar system somewhat align once every 500 years and are grouped within 30 degrees every one to three alignments. When astrologers describe the planets as being aligned, they do not necessarily mean that all of the planets line up on a perfectly straight line. read more