NVvW annual meeting 2021

On Saturday, November 6, 2021, I conducted a workshop on the image of the crescent moon in a camera obscura. Ibn al Haytham wondered why the image of a partial solar eclipse is a crescent, but the image of the crescent moon is not. Triangles of four meter long were constructed with strings to make clear that a triangle with a top angle of 0,5° matters.

Program

Workshop

Powerpoint

GeoGebra