الحسن بن الحسن بن الهيثم .. كتاب المائة الأوائل

Al-Hassan bin Al-Hassan bin Al-Haytham

1038 AD -

He was born in the year 1038 in Basra, and he was the first to think about building the High Dam in Egypt. He said while he was in Baghdad: If I were in Egypt, I would have done something to achieve the benefit in each of its cases, whether it was an increase or a decrease.

Ibn al-Haytham invented an astronomical method by which the height of the pole could be determined at any place, and then the latitude of that place. He believed in science and adopted it (before Frans Bacon took it) (and this method is used to this day.).

He wrote the Book of Views, and in the seventh article of the Book of Views, the genius of Ibn al-Haytham is evident, as he was exposed to three main issues:

1 - The effect of refraction of light when it passes through the surrounding air layer in perceiving the distance between two planets.

2- The effect of refraction in a layer of vapor or what flows. The stream of vapor is thicker than air in perceiving the distance between the two planets.

3 - Apart from refraction, there is the effect of accidental exposure.

some times and not others. This phenomenon alone makes the planets count the horizon larger than they are in the middle of the sky.

Thus, Ibn Al-Haytham formulated his theory in explaining the difference in the apparent distance between the planets, and it is a valid and recognized interpretation until now.

In addition, Ibn Al-Haytham gave correct laws for spheres, pyramids, inclined cylinders, sectors, and circular segments.

And his way to set latitude is famous:

Ibn al-Haytham wrote more than 200 books.