How often do all the planets align?

Answer

In technical terms, complete planetary alignment refers to the phenomenon where all planets form a straight line and inclined in the same quadrant. It occurs once in every 200 years. However, the term planetary alignment has been often confused with ?planetary configuration?, which refers to the phenomenon involving at least two planets that align with the sun but not forming a complete straight line.
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1 Additional Answer
The planets will never be all aligned but they come close to this. This happens every 50 to 100 years. This is because, they revolve round the sun at different intervals. So, at some point they get closely aligned.
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