This answer to What kind of triangle is formed by three unequal masses in a circular restricted three body orbit? explains that

In the Newtonian limit, an equilateral 3-body solution exists for any combination of masses

and links to Triangular solution to general relativistic three-body problem for general masses which stars with "Lagrange’s equilateral triangular solution for the three-body problem" and looks at relativistic ("post-Newtonian") effects.

In the circular restricted three body problem of Lagrangian points fame one body is a "test mass" with no significant effect on the other two, but apparently three massive bodies can also have a circular orbit solution where they still form an equilateral triangle, as $L_4$ and $L_5$ do in the CR3BP.

Where did Lagrange first write about the equilateral triangular solution for the three-body problem where all three bodies have non-zero mass?

  • $\begingroup$ This link may prove useful for you. The name of the book is "Three Body Dynamics and Its Applications to Exoplanets". Link to google books $\endgroup$ – Nachiket Kulkarni May 11 at 15:10
  • $\begingroup$ It seems your title question is not exactly the same as your body question. Or maybe I'm misinterpreting that final sentence as "when ...." ? $\endgroup$ – Carl Witthoft May 12 at 12:55
  • $\begingroup$ @CarlWitthoft I'm looking for the original writing, did Lagrange write it in a scientific paper, or in a letter, or in a journal? Thus "where" was it written. $\endgroup$ – uhoh May 12 at 14:36

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