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•   / magellan-and-the-first-circumnavigation-of...  
• https://www.amazon.com/How-Find-Earth...
• https://books.google.com.eg/books/abo...
• https://books.google.com.eg/books/abo...
• https://books.google.com.eg/books/abo...
• https://muslimheritage.com/the-book-o...
• https://www-istp.gsfc.nasa.gov/starga...
•   / 691701.how_did_we_find_out_the_earth_is_ro...  

Images Attributions:
• researchgate . net (Trundholm sun chariot)
• Wikimedia Commons (The Hindu Earth/ Anaximander/ Aristotle / Eratosthenes/ Al-Biruni/ Ptolemy/ Astrolabe/Vasco Da Gama/ Shehab Eldin Ahmad ibn Mājid/ Christopher Columbus/ Ferdinand Magellan/spacecraft/Astronaut on moon/ Carl Sagan)
• ESA/Hubble & NASA 2017 (Northern Star)
• Media.sciencephoto. com (Christopher Columbus with King Ferdinand and Queen Isabella)
• Nasa (earth from moon)