What is a astroble?

Answer 1

A Greek-Arabic hybrid term(astroble), means star- holder. It is a flat, handled disk-shaped map of the sky that helped astronomers and mariners know where the sun and the stars should be at different times of the year. the perfection of this Greek invention is one of the medieval Islam's greates astronomical controbutions. After many improvements where introduced by Muslims, colombus used it in discovering America.