Exploring around Fairbanks took us north of 65° latitude but not quite to the arctic circle, west to the Chena Hot Springs, and south to North Pole. The weather was perfect for everyting except aurora viewing. Late-night ice clouds obscured our view at the very time when the aurora was in action. We could just barely make it out through the mist. At other times it was very clear and we enjoyed a dark sky full of stars and planets. On the way north, we stopped at a viewing area set aside for tourists to see the Alaskan Pipeline up close. North of Fairbanks, the sun slowly finishes its daily migration from southeast to southwest. Livengood Road Maintenance Station: 65.52308°N, 148.54707°W, the northernmost stop in our journey. We chose this location to turn around not for any scenic beauty (obviously), but because we were running out of daylight, had limited fuel, and ambient air temperatures dropping from the balmy daytime high of about -20°F to a likely overnight low of close to -40°F. A delicate sliver moon looks down on the darkened, snow-covered tree line after sunset. After dark, at the Chena Hot Springs resort, the large outdoor rock pool makes for a relaxing evening against the backdrop of the -35°F ambient air temperature. South of Fairbanks is a little town called North Pole. The entire town has a Santa Claus theme and is the destination for huge quantities of Christmas letters from children all around the country.
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Frequently people land on this site with search queries like "what part of the eye corresponds to the camera shutter". With a camera, the shutter opens for a very precise amount of time and allows light to hit the film or sensor inside the camera. The closest comparison to that in the eye would be the eyelid that can open and close but its purpose is more analogous to that of the lens cap than the shutter. Shutter mechanisms come in a variety of configurations. More detailed information about camera shutters can be found in this article [Wikipedia].
Camera lenses also have a diaphragm iris [Wikipedia] which adjusts to increase or decrease the amount of the available light that can pass through it during any given period of time. This corresponds directly to the iris in the eye [Wikipedia] which serves the same purpose. I suspect many people confuse this with the diaphragm-type shutter mechanism, however both the eye's iris and that of the camera are visible through the lens while the shutter is generally inside the camera and out of sight. In modern cameras, the iris is usually fully open except at the moment when a picture is taken so it can be seen to move right about the same time as the shutter.