The phenomenon of planetary alignment only occurs once every several hundred years. Such an alignment occurs when all of the planets line up on the right side of the sun within 90° of each other or closer. This positioning of the planets is visible to the naked eye. A true planetary alignment occurred in May of 2002. Before that, such an alignment had not occurred since April of 1128.
The following fact is not mentioned in the selection:
Explanation
The selection states that in a planetary alignment, the planets line up on the right side of the sun.