perihelion

noun2

1. •
   The point in the elliptical orbit of a comet, planet, etc., where it is nearest to the Sun.

   • This rotational motion could have the axis of minimum moments of inertia nearly aligned with the Sun–Mercury radius vector at every perihelion passage. — 1965
2. •
   (figurative) The highest point or state; the peak, zenith.

   • This brilliant trick was the invention of the late Dr. Hofzinzer, of Vienna, who, at the perihelion of his fame, was regarded as the greatest card conjurer in the world. — 1909