Shape of the crescent moon

In a camera obscura with a small aperture, one may observe a sun eclipse. Observing a crescent moon requires a larger aperture, but the image will become distorted.

Powerpoint Workshop Istanbul

PDF Workshop Exercises Istanbul

Youtube: Klokhuis leader featuring Newton

Thousand years ago, Ibn al-Haytham investigated the shape (image) of a crescent solar eclipse through a pinhole of a camera obscura. For a large aperture, the shape looks distorted. To explain this phenomenon, you have to understand that the sun has a surface of many points.

Experiment