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Alegoría de la navegación: Averroes con una ballestilla.
Aquí tenemos una curiosa imagen de Averroes, relacionada con la astronomía y con la topografía, que nos ha enviado el profesor de la Universidad de Granada Mario Ruiz Morales, Doctor en Ciencias Matemáticas e Ingeniero Geógrafo, miembro de la Real Sociedad Geográfica.
El instrumento que sostiene Averroes se llamó Vara de Jacob, ballesta y ballestilla (en inglés cross staff). Sirve para calcular la altura del sol y las estrellas (la polar preferentemente) sobre el horizonte, lo que permite calcular la latitud del lugar. Es un instrumento de navegación y astronomía anterior al sextante.
El autor de la obra es el pintor italiano Paolo Veronese (1557) y el cuadro se conserva en el Museo de Arte de los Ángeles.
Muy curiosa esta pintura. Además de la ballestilla, instrumento astronómico y de navegación, podemos ver que se apoya cin la otra mano en una escultura de una serpiente, símbolo de la sabiduría.