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David W. Tschanz

David W. Tschanz is a medical/military historian based in KSA. He is also an epidemiologist, web developer, computer systems engineer, editor and demographer.

Author Articles

Unlocking The Secrets Of Sight

Unlocking The Secrets Of Sight

Edited by Karima Burns The hot and dusty plains of the Middle East have always created an environment in which endemic diseases of the eye such as trachoma and ophthalmia are unusually prevalent. During the Middle Ages, blindness was the leading cause of disability throughout the Islamic world, and an extensive specialist literature developed in …

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Alhazen: Master of Optics

One of the brightest names in Islamic medieval sciences is that of mathematician and scholar Abu ‘Ali al-Hasan bin al-Hasan bin al-Haytham, known as “Alhazen” to the Western world. Born in Basra, Iraq in 965, he won repute there as a mathematician and engineer. He was invited to move to Cairo, Egypt by the Fatimid …

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Al-Battani: the Trigonometrical Genius

Al-Battani: the Trigonometrical Genius

Abu Abdallah Muhammad Ibn Jabir Ibn Sinan Al-Battani Al-Harrani, known in the West as Albategnius, is considered the greatest astronomer of his time and one of the greatest during the Middle Ages. Al-Battani was born around 858 C.E. in Battan, a state of Harran, and was first educated by his father Jabir Ibn San’an Al-Battani, …

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