July 19, 2108: All Eight Planets On Same Side of Sun: Mathematical Astronomy Morsels

Could all the planets line up on one side of the Sun?

Jean Meeus addresses this in Mathematical Astronomy Morsels (Willmann-Bell, 1997). He points out that you have to start by defining the question precisely. Let’s reduce the problem to two dimensions and ask whether all the planets can have the same heliocentric longitude (they can never line up in three dimensions because their orbital planes are all slightly different). Then, to simplify the arithmetic, we’ll say that two longitudes count as “the same” if they’re within 1.8° of each other.

Beginning on July 19, 2018

There will be an usual alignment of the planets in our solar system as they to be located on the same size of the sun. The alignment will start on July 19, 2018 and continue into August 2018.

https://www.youtube.com/watch?time_continue=9&v=jDjePC47W6k

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