Como encontrar el sur por las estrellas

Magallanes.jpgLa Cruz del sur, aquella constelación de las noches del hemisferio sur y que podemos ver en las banderas de Nueva Zelandia, Australia y Magallanes, nos da la referencia para encontrar el sur terreste mirando al cielo. Primero debemos encontrar la cruz en el cielo, tarea bastante sencilla. Luego proyectar cuatro veces y medio la longitud del palo mayor de la cruz hacia abajo de la cruz, con lo cual podemos encontrar el punto llamado "sur celeste", que representa la prolongación del eje de rotación de la Tierra (en el norte celeste, el equivalente al punto antes mencionado pero en el hemisferio boreal, se ubica casi exactamente la estrella polar).

Desde el sur celeste, debemos tirar una linea hacia el horizonte y perpendicular a éste, para determinar la posición del sur terrestre. Mirando hacia ese punto, estaremos enfrentados hacia el sur.

Les adjunto imagenes para entender la situación. La segunda imagen, que correspondería a una situación unas horas después de la primera, se aprecia que la cruz del sur ha girado (con respecto al sur celeste), pero la posición de este último no ha cambiado (como todas las estrellas parecen "girar" con respecto a ese punto, éste no se moverá de su posición en toda la noche).

sur2.jpg

sur1.jpg

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Comentarios

Que sorpresa encontrarme con mi bandera por estos lados!!

Muy interesante tu artículo, la verdad que yo nunca sé donde estoy parada....además viniendo de Natales, para mi prácticamente todo es norte jejej

Haré el intento entonces para ver si me resulta los de la Cruz del Sur.

Saludos Juan Carlos.

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