Primero un hat tip a
srguillot por haberme interesado por la órbita de Mercurio. Definitivamente hay cosas maravillosas en este mundo. Algunas de ellas sólo son visibles en el ojo de la mente pero no por ello menos hermosas.
At certain points on Mercury's surface, an observer would be able to see the Sun rise about halfway, then reverse and set before rising again, all within the same Mercurian day. This is because approximately four days prior to perihelion, Mercury's angular orbital velocity exactly equals its angular rotational velocity so that the Sun's apparent motion ceases; at perihelion, Mercury's angular orbital velocity then exceeds the angular rotational velocity. Thus, the Sun appears to be retrograde. Four days after perihelion, the Sun's normal apparent motion resumes.
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