This forum answer included these cool graphs and a good explanation.
https://astronomy.stackexchange.com/questions/12824/how-long-does-a-sunrise-or-sunset-take/13053#13053
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This forum answer included these cool graphs and a good explanation.
https://astronomy.stackexchange.com/questions/12824/how-long-does-a-sunrise-or-sunset-take/13053#13053