Which optical device implemented geometric principles to determine altitude angles during the Islamic Golden Age?

💡 Explanation

When celestial altitude angles are needed for astronomical calculations, a planispheric astrolabe uses geometric relationships to measure angles because shadow projection and similar triangles link the observed angle to instrument markings. Therefore, a planispheric astrolabe results, rather than a camera obscura (image projection), burning mirror (solar concentration), or microscope (magnification), which address different optical phenomena.

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