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For anyone living north of san Francisco it's pretty much a requirement. If I didn't use artificial light my winter days would be 6 hours long and my summer days would be 18 hours longm


If that were true, every latitude north of San Francisco would have been completely uninhabited for most of human history.


I remember being quite surprised when I noticed (while I was actually in San Francisco) that its about the same latitude as Lisbon in Portugal. So you are talking about almost all of Europe.




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