E416 -- Meditationes in quaestionem utrum motus medius planetarum semper maneat aeque velox, an successu temporis quampiam mutationem patiatur? & quaenam sit ejus causa? …

(Reflections on the question: Does the medial motion of the planets remain at constant speed, or does it, in the course of time, undergo some change? And what might be the cause of this?)


Motto on the title page:
“Ipse Pater statuit, quaevis coeli astra moveret”;
probably written by L. Euler.

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