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Afeliu

Afeliu
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Afeliu. Del griegu απο = lloñe de, y ηλιοσ = el Sol. Afeliu.Teniendo en cuenta que les órbitas de los cuerpos celestes tienen normalmente forma d'elipse, l'afeliu ye'l puntu más alloñáu de la órbita d'un planeta alredor del Sol. Ye l'opuestu al Periheliu, el puntu más cercanu al Sol. Nos elementos orbitales, representase por Q. Si a ye la distancia media y e la escentricidá, entós Q=a (1+e).

Tala comu establez la segunda de les lleis de Kepler, la velocidá de tresllación del planeta ye mínima nel afeliu, polo que ye máxima nel periheliu.

A entamos del mes de xunetu (xeneralmente, el día 4), nel afeliu, la Tierra dista 152.6 millones de quilómetros del Sol, demientres qu'a entamos de xineru (tamién el día 4), nel periheliu o puntu de la so órbita más cercanu al Sol, la Tierra alcuéntrase a 147.5 millones de quilómetros del Sol.

Ver tamién

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Afeliu
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