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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 />
soft pink, orange, purple ribbon<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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