RT @hist_astro: Oldest known Arabic copy on construction of astrolabe (1292), by al-Farghānī @BLQatar qdl.qa/en/archive/810… http://t.co/sRsX6Pq7xE
RT @hist_astro: Oldest known Arabic copy on construction of astrolabe (1292), by al-Farghānī @BLQatar qdl.qa/en/archive/810… http://t.co/sRsX6Pq7xE