[Pramāṇa](https://indike.org/pramana/) › [Physical](https://indike.org/pramana/inp) › [Artefacts](https://indike.org/pramana/inp.artefact) › [The British Museum, London](https://indike.org/pramana/inp.artefact.bm) › Astrolabe # Astrolabe Astrolabe, with three plates for latitudes 19° 26° 21° 23° 28° 35° with numbered almucantars every 6° and lines for unequal and Babylonian hours. There was probably originally a fourth plate; on the back are a sexagesimal sine and cosine graph of the arcs of the signs with an unequal hour diagram, and a shadow-square; - **Kind:** artefact - **Date:** 1700–1799 CE --- Source: [https://indike.org/pramana/inp.artefact.bm.2011-3034-1](https://indike.org/pramana/inp.artefact.bm.2011-3034-1) · Pramāṇa