👉 An astrolabe is a device used to measure the positions of stars and planets using astronomical observations. It consists of two telescopes, one on the ground and one in orbit around the Earth. The observer uses a compass or other measuring instrument to align the compass with the position of the star being measured, then places the telescope on the ground so that it is pointed at the star's position. The telescope records its observations and displays them through an astronomical display, which can be used to create maps