I am lucky enought to be going to Gates of the Arctic National Park (60 miles north of the Arctic Circle) this summer. The maximum altitude for the sun will be about 40 degrees. In Dallas, the summer sun gets that high by 8:45 am. Does that mean the light will be good for landscape photography all day? I will also be near Trimble Glacier and Big River Lakes. I would be happy to get any suggestions on technique or location. The sunrise and sunset last several hours!