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Interesting observation I came up with as I was looking at this aerial of Fidi and Soma. I was looking at the area where the TBTT will be located and I started noticing the shadows that were being cast by the other tall buildings and a thought immediately popped into my head. It seems to me that the sun's position is about late afternoon based on the direction the shadows are pointing (strectching NE, so the sun must be in the West).
With that being said, I don't understand how the Tower is going to cast shadows on Union Square or Justin Hermann plaza. Even if it does they won't be there for any extended period of time (being as though the sun is constantly moving). I just feel the whole shadow issue is a fairy tale concept the NIMBY's use to stop construction of super talls in SF at any cost.
I know this issue has been pounded into the ground, but just thought I'd point it out. A little food for thought.