This is an illustration from Al-Biruni's astronomical works, explains the different phases of the moon.
Flat World Karte von Abu Rayhan al-Biruni (ca 1000 nach Christus - Basis auch von UNO Flagge.)
“Lunar phases in al-Biruni's "Kitāb al-tafhīm li-awā’īl ṣinā‘at al-tanjīm", c. 1436 @BLQatar https://t.co/gOka4RZxcm”
Al-biruni : Greatest Polymath of the Islamic Golden Age (Vol 0) (Library) (Bridget Lim & Bill Scheppler)
Al-Biruni - Wikipedia
Al-Biruni is regarded as one of the greatest scholars of the medieval Islamic era and was well versed in physics, mathematics, astronomy, and natural sciences, and also distinguished himself as a historian, chronologist and linguist.
Abū Rayḥān al-Bīrūnī - Wikipedia, the free encyclopedia