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Sunset or sundown is the daily disappearance of the Sun below the horizon as a result of Earth's rotation. The time of sunset is defined in astronomy as the moment the trailing edge of the Sun's disk disappears below the horizon in the west. The ray path of light from the setting Sun is highly distorted near the horizon because of atmospheric refraction, making the apparent astronomical sunset occur when the Sun’s disk is already about one diameter below the horizon...

Penguins (order Sphenisciformes, family Spheniscidae) are a group of aquatic, flightless birds living almost exclusively in the southern hemisphere, especially in Antarctica. Highly adapted for life in the water, penguins have countershaded dark and white plumage, and their wings have become flippers. Most penguins feed on krill, fish, squid, and other forms of sealife caught while swimming underwater. They spend about half of their lives on land and half in the oceans...

Tropicana Sun is a very cool art installation in Trafalgar Square, London, that brightens a cold dark mid-winter day. Dawn broke early today after an artist installed a fake sun in Trafalgar Square to chase away the Monday morning blues. Delighted onlookers in central London bathed in warm sunlight as the spectacular installation began to glow at 6.51am on a chilly January day...

Car trailers that look like the babies of the real cars. One such trailer costs about $3,700. Travel trailer A travel trailer or caravan is towed behind a road vehicle to provide a place to sleep which is more comfortable and protected than a tent (although there are fold-down trailer tents). It provides the means for people to have their own home on a journey or a vacation, without relying on a motel or hotel, and enables them to stay in places where none is available...

A POTD is an acronym for "Photo of the Day", "Picture of the Day", "Post of the Day" or "Poll of the Day". It is a term most commonly used by online digital photography communities as an honor to outstanding photos that are selected daily from among that community's membership. They can either be tagged as POTD or displayed in a special page on that site...