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B2 THE COAST NEWS<br />

DEC. 16, 2011<br />

<strong>The</strong> story behind sunset, twilight and dusk<br />

KYLE<br />

STOCK<br />

<strong>Coast</strong>al Cosmos<br />

We take them for granted.<br />

Fundamentally, they define<br />

our day. Earth spins on its axis,<br />

the sun appears to rise in the<br />

morning, travel through the sky<br />

and then dive into the ocean<br />

with a splash of vibrant colors.<br />

Sunsets occur everyday, every<br />

where on Earth, except for<br />

small areas of the Arctic and<br />

Antarctic Circles.<br />

We are fortunate to live on<br />

a west-facing coastline, which<br />

affords us unobstructed views<br />

of nature’s finest canvas.<br />

Sunset is defined as the<br />

moment when the disc of the<br />

sun disappears below the horizon.<br />

This is determined by the<br />

observer’s location on Earth<br />

and Earth’s position in the cosmos.<br />

Twilight is the light that<br />

lingers after sunset and is<br />

bright enough to read by. Dusk<br />

is the falling of darkness and<br />

the illumination of planets and<br />

bright stars in the sky.<br />

Luminous colors and various<br />

optical phenomena often<br />

enrich our horizon as the sun<br />

sets. What causes the beauty?<br />

Nuclear fusion in the sun sends<br />

electromagnetic radiation into<br />

the solar system. One component<br />

of that radiation is light.<br />

<strong>The</strong> water molecules and dust<br />

in Earth’s atmosphere refract,<br />

reflect and scatter the light.<br />

Optical refraction happens<br />

when waves of light energy<br />

pass through different sub-<br />

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Sunsets are the subject of countless beautiful works of art, but it’s science<br />

that makes them so strikingly pretty. Photo by Kyle Stock<br />

stances, such as water molecules,<br />

and white light is dispersed<br />

into the colors of the<br />

rainbow.<br />

<strong>The</strong> scattering of violet<br />

and blue light causes the brilliant<br />

daytime sky. As the sun<br />

sets, light passes through more<br />

and more atmosphere to reach<br />

the observer. <strong>The</strong>se extra molecules<br />

cause the light to scatter<br />

and refract more toward the<br />

red end of the spectrum. <strong>The</strong><br />

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above the horizon during twilight<br />

is known as the Belt of<br />

Venus. It is so named because<br />

bright Venus regularly appears<br />

there as light fades. <strong>The</strong> dark<br />

line below Venus’ Belt is the<br />

shadow that Earth casts on its<br />

own atmosphere.<br />

Sitting in the ocean, waiting<br />

for a wave, the sun sets<br />

unassumingly with cirrus<br />

clouds high in the sky: very<br />

peaceful. <strong>The</strong>n, boom! <strong>The</strong> sky<br />

explodes with psychedelic reds<br />

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and oranges. <strong>The</strong> clouds burst<br />

with color, the ocean becomes<br />

one with the sky, reflecting<br />

every shade. This is the afterglow.<br />

When the sun’s light is<br />

scattered high in the atmosphere<br />

by water, dust and<br />

aerosols.<br />

A sun pillar is a vertical<br />

ray of light extending upward<br />

from the sun as it sets.<strong>The</strong>y are<br />

caused by the reflection of light<br />

off ice crystals high in the<br />

atmosphere. When there is an<br />

abundance of ice particles in<br />

the upper atmosphere a sundog<br />

will appear horizontally to<br />

the setting sun. Sundogs, or<br />

parhelia, are bright spots<br />

and/or small rainbows that follow<br />

the sun below the horizon.<br />

<strong>The</strong>y are frequently associated<br />

with halos of light around the<br />

sun.<br />

Have you ever seen a<br />

green flash? Do they even<br />

exist? Yes, the infamous green<br />

flash is a real optical phenomenon.<br />

<strong>The</strong>re even variations of<br />

this marvel.<strong>The</strong>y are caused by<br />

a mirage similar to the shimmering<br />

road ahead on a hot<br />

day. Warm air covers the surface,<br />

while cooler air ascends<br />

upward. Shimmering on the<br />

horizon causes the sun’s disk to<br />

warp. When distortions overlap<br />

exactly as the sun passes below<br />

the horizon, a green flash<br />

(might) majestically appear.<br />

Not all sunsets are postcard-worthy.<br />

Sometimes it is<br />

cloudy and others are simply<br />

mundane. However, if you pay<br />

attention, you are sure to witness<br />

phenomenal beauty as the<br />

Earth spins under the sun and<br />

light dances through the atmosphere.<br />

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