This shut out the sun, causing decades of continuous winter sufficient to trigger an advance of ice sheets that, even when the dust cleared, kept the climate cool for more than a thousand years, at least in the Northern Hemisphere.
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The picture below is a snapshot of the sun caught during the winter (or, depending where you are, summer) solstice.
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Outside a crisp winter sun reflects on Plymouth Sound, a stunning amphitheatre of cliffs overlooking the sea.
The warmth in the Arctic that this arrangement has brought may diminish the regeneration of sea ice over the course of this winter, meaning that next summer's sun can push back the boundaries further.
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"When she left hospital, I asked the army if I could take her home to convalesce because her diabetes was so serious, but they said she had to go for winter training with the army team in northeastern China, " says Sun of her daughter.
Altered day-night cycle: the Antarctic winter involves a period of over three months of complete darkness where the sun does not rise above the horizon.
Over the winter, special triple-pane windows that capture 64% of the sun's warmth keep the house cozy even on 5-degree days so cozy that Mr. Konkol had lush indoor herbs, blooming orchids and a lemon tree.
Vitamin D researchers estimate that up to half of Americans might be getting inadequate amounts, especially in the winter months when the sun is low.
They used their knowledge of the astrological movement of the sun through the seasons to align their pueblos on south facing cliffs to receive direct heating sunlight in winter, yet be shaded in the summer.
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Since no dinosaur fossils have ever been found in sediments dating from after this point, conventional wisdom has it that the largest creatures ever to roam the earth must have been cut down in their prime - victims of an asteroid impact that sparked firestorms, acid rain and a nuclear winter that blotted out the sun.
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