Figure 1: View of Al-Azhar mosque courtyard in Cairo. The mosque, founded by the Fatimid caliph Al-Hakim in 990, was under construction when the 1006 supernova appeared in the sky. Source: http://www.sacred-destinations.com/egypt/cairo-al-azhar-university.htm.
"Three Times Greater than Venus": Ibn Ridhwan's Observation of Supernova 1006LEARN MORE
1001 years ago, an extraordinary astronomical event...