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Here the author describes the cause of the precession as due to the sun being part of a binary system… meaning our sun has a twin ( as many suns do). One argument he proposes, that I find convincing, is that the other planets in our solar system do not precess in relation to the earth. Only stars outside the solar system do. If you were on Mars, you would observe the same precession. This contradicts the cause as described above. Rather, the entire solar system is rotating about a common center of mass with another body.
This would seem to be a more reasonable explanation for the root cause of precession.