Lots of mechanical aids to calculation and measurement were created for astronomical and navigation use. The planisphere was a star chart invented by Abū Rayhān al-Bīrūnī while in the early 11th century.[eight] The astrolabe was invented inside the Hellenistic globe in possibly the 1st or 2nd hundreds of years BCE https://andretlbqx.blogsidea.com/32253425/everything-about-in