The Manhattan Sundial - Reality Check|
Of course the way to test this program is to go out on the street and see if the shadow falls where the code says it will. So the code said that on March 10, 2013, the shadow of the tip of the Empire State Building would cross Fifth Avenue, between 38th and 39th street at about 2:45 pm.
Earlier, while waiting for the shadow to cross 37th Street, I as poised infront of a hotel for a long time. I realized that the doorman was puzzled by what I was up to, so I walked over and told him. He came out of the lobby and watched the sun pass behind the tower of the Empire State Building with me. He then turned to me and said, "Everyday I see that building, but not with your eyes."