Many mechanical aids to calculation and measurement have been created for astronomical and navigation use. The planisphere was a star chart invented by Abū Rayhān al-Bīrūnī while in the early eleventh century.[8] The astrolabe was invented within the Hellenistic entire world in possibly the 1st or 2nd hundreds of years https://marcoucins.thekatyblog.com/25767642/a-simple-key-for-pc-unveiled