The Earliest Surviving Dated Astrolabe – An astronomical instrument used for observing planetary movements, was indispensable for navigation. A type of analog calculator, brass astrolabes were developed by mathematicians in the medieval Islamic world.
Made in this astrolabe was presented as a gift to the mosque at Fez in Morocco. It is unusual in having a perpetual calendar of the Muslim and Christian years, a rare feature occasionally found on Maghribi astrolabes.
The biggest, brightest Moon of the year is almost here. On June a Supermoon will be larger and brighter than a typical Full Moon, and this won't occur again until August, Or it will be overcast and we missed the whole thing!