During my time studying at the Library of Alexandra, I had many opportunities to correspond with other great thinkers.  During that time I noticed something about shadows.  One of my colleagues from the city of Syene in southern Egypt, noted that on the Summer
Solstice the sun was directly overhead,  and that vertical objects cast no shadow.  Now with that established, get a consensus on the distance from the earth to the sun. Its about 149,600,000 km by my calculations. 

Any debate on the stated facts to this point?