Sunday, August 17, 2008

dusk


Photos where taken last April 2, 2006

My fiance and I love photography. When our hectic schedule permits, we usually spend our weekends together taking pictures. We cant help but admire God's wonderful creation.
Here are some trivia about dusk.

Did you know that the new calendar days of Jews begin during dusk?
While sunset marked the close of the daylight period, for the Jews it marked the start of the new calendar day, which officially began at sunset, being counted from evening to evening. (Le 23:32; compare Mr 1:21, 32, which shows that the day, in this case a sabbath, ended in the evening.) (from watchtower)

Did you know that during dusk, an unusual phenomenon occur called green flash or in rare case the blue flash?
Here's the explanation why. As the last edge of the sun dips below the horizon, the sun's light splits into a spectrum like a rainbow. Red light appears on the bottom of the spectrum, and blue light is on the top. As the sun continues to descend, the red portion of the spectrum falls below the horizon and the blue portion is usually scattered by the atmosphere. It is at this instant that the last bit of visible light can flash green. But why green? Because green is the other primary color in light. When the sky is heavily polluted, the green flash is seldom seen, and the blue flash occurs only when the atmosphere is exceptionally clear and enough blue light pierces the sky to cause a brilliant flash to appear.

What gives the dusk the red and orange color?
Sunlight streaming down to the earth contains all the colors of the rainbow. When this light strikes the earth's atmosphere, the atmosphere acts much like a giant prism and scatters, or diffuses, the light. The extent to which a light wave is diffused, however, depends on its wavelength. Blue light waves have a shorter wavelength and are widely scattered throughout the atmosphere. That is why the sky appears blue when the sun is well above the horizon on a clear day. But when the sun is near the horizon—such as at dusk—the sunlight must travel through more of the atmosphere to reach our eyes. As a result, the highly scattered blue light does not reach us. On the other hand, the longer waves, such as red, can more easily penetrate the dense atmosphere. This gives the dusk its familiar red or orange color.
till next time. live and let live....enjoy life to the fullest

1 comment:

Rowena said...

They're beautiful. I love photography too but lately haven't been able to take any snaps.