Meanings (ES + gloss)
perihelio
The point in the elliptical orbit of a comet, planet, etc., where it is nearest to the Sun.
The base of the system is that all planets, comets and satellites go through a reversed change of motion, volume, distance and density at their perihelions and aphelions, each orbi…
This rotational motion could have the axis of minimum moments of inertia nearly aligned with the Sun–Mercury radius vector at every perihelion passage.
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