domingo, 9 de diciembre de 2007

Altura del sol

La altura del sol

La recepción de la radiación solar en la superficie terrestre depende, en gran medida, de la altura del sol, es decir, del ángulo que forman los rayos solares con la horizontal. La altura del sol varía en función de la latitud, época del año y hora del día. El condicionamiento latitudinal obedece a la forma de la Tierra y a la inclinación de su eje sobre el plano de la eclíptica, con el que forma un ángulo de 23º 27´; a ello se debe que en el ámbito intertropical la altura del sol quede entre valores de 66º 33´ y 90º, verticalidad esta última que, sobre el ecuador, se produce en los equinoccios, y en cada trópico el solsticio de verano correspondiente; mientras, en latitudes polares, la altura máxima del sol no pasa de 23º 27´ y desciende a 0º, deparando una noche de seis meses.

Por su parte, el ciclo anual responde al movimiento de traslación, con máximas alturas en verano y mínimas de invierno. Finalmente, el ciclo diario coincide con el movimiento aparente del sol; cuyo orto o salida, a distinta hora, todos los días, merced a la rotación de la Tierra, se produce por el este, orientación desde la que el sol se eleva sobre el horizonte; a partir de este momento el sol se levanta hasta el máximo correspondiente, en función de la latitud y época del año, a medio día, para descender luego hasta su puesta u ocaso por el oeste, donde traspone la línea del horizonte.

Información relacionada con Altura del sol:

- Temperaturas mínimas en España
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