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Originally Posted by aluminum
Hellooooooo, we are living in the Northern Hemisphere and north of Tropic of Cancer, Sun can NEVER, EVER be in northern eastern, north western or any northern sky.
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That is simply not true.
I don't think you've completely thought through the dynamics of the seasonal variations in solar position. Here is a nice webpage that explains it:
http://curious.astro.cornell.edu/que...php?number=186
Also, here is the NOAA's solar position calculator:
http://www.srrb.noaa.gov/highlights/sunrise/azel.html
If you calculate San Francisco's sunrise azimuth for today's date, August 17, you'll find that it is 72.2 degrees. That's 17.8 degrees north of due-east. You can also confirm that sunrise coordinate with any number of astronomy or weather forecasting sites (or, simply, with your own eyes and a compass, provided that you're willing to get up at sunrise on a Saturday morning.
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My apologies to the forum for getting off-topic.
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If this Union Square is anywhere south of the building, it can NEVER cast a shadow on it.
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Union Square is slightly south of the proposed tower, and it will indeed be shaded during the early morning hours on certain days of the year. As others have already noted, however, the shadow effect of the new tower will be substantially mitigated by the placement of existing buildings, the ubiquitous summer morning fog, and the fact that the early morning hours are not an especially busy time for Union Square tourists and sunbathers. As such, I can't imagine that it will be a major consideration for the city when working out the details of whatever proposal is chosen.