Jun 25
I’m obsessed with painting light lately
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I’m obsessed with painting light lately
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TSRNOSS. Page 196.
@ Bang Chan in case he's still wondering why was the moon pink.
When light passes through the Earth's atmosphere, it scatters off of particles in it. These particles like to scatter blue light more than they do red light. Astronomical objects like the Sun or the Moon look red because the redder wavelengths from the objects penetrate the atmosphere better than the bluer ones. So the Moon tends to look reddish when it is rising or setting because that's the time when the light has to travel through the most atmosphere to get to the Earth.
Also this is why the sky is blue: blue light from the Sun is scattered in all directions on its way to the Earth.
From Earth Science Picture of the Day; July 12, 2018:
What Glows in the Night? Photographer and Summary Author: M. Taha Ghouchkanlou
What glows in the night? On this night along the shore of the Gulf of Oman in Iran, several interesting glows were evident -- some near, but some far. The foreground surf glimmers blue with the light of bioluminescent plankton. Next out, Earth's atmosphere scatters light which acts to brighten opaque clouds near the horizon. Further out, the planet Venus glows brightly near the image center. If you slightly avert your eyes, you should be able to see a diagonal band of light as it merges with the glow of Venus. This band is the zodiacal light. At right center, the glow of the Milky Way dominates. Photo taken on November 26, 2016.
Photo Details: Camera: NIKON D810; Software: Adobe Photoshop CS6 (Windows); Exposure Time: 25.000s; Aperture: ƒ/2.8; ISO equivalent: 2500; Focal Length (35mm): 14.
Gulf of Oman, Iran Coordinates: 25.30926, 58.62304
Related Links
Bioluminescence in the Gulf of Oman
Zodiacal Light Observed Over Tibet
Taha's Instagram site
Student Links
Creatures of Darkness
All that Glitters...
Earth Observatory
Dust Storm on the Gulf of Oman
The Science Research Notebooks of S. Sunkavally. Page 126.
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Color and Haze Meter
A color and haze meter is an analytical instrument used to measure and quantify the color and haze characteristics of liquids, such as beverages, oils, chemicals, and pharmaceuticals. Three types of light source A, C, D65
From Astronomy Picture of the Day; June 13, 2018:
Red Cloudbow over Delaware Michael C. Neff (Neffworks Artography)
What kind of rainbow is this? In this case, no rain was involved -- what is pictured is actually a red cloudbow. The unusual sky arc was spotted last month during sunset in Rehoboth Beach, Delaware, USA. When the photographer realized that what he was seeing was extraordinary, he captured it with the only camera available -- a cell phone. Clouds are made of water droplets, and in a cloudbow a cloud-droplet group reflects back light from the bright Sun (or Moon) on the opposite side of the sky. Similar phenomena include fogbows and airplane glories. Here, the red color was caused by atmospheric air preferentially scattering away blue light -- which simultaneously makes most of the sky appear blue. A careful inspection reveals a supernumery bow just inside the outermost arc, a bow caused by quantum diffraction.
From Earth Science Picture of the Day; May 8, 2018:
Quetelet Scattering and Ponies on Assateague Island Photographer and Summary Author: John A. Adam
I noticed these iridescent colors on the surface of a pond while on a walk on the island of Assateague, Virginia. They're caused by interference between sunlight reflected from the pond surface and light scattered by pollen or dust particles floating just above the surface (and subsequently reflected by it). A fine example of this phenomenon can be found here. It's called Quetelet scattering, named for the polymath Lambert Adolphe Jacques Quetelet (1796–1874) a Belgian astronomer, mathematician, statistician and sociologist. He founded (1828) and directed the Royal Observatory in Brussels and was influential in introducing statistical methods to the social sciences. He also developed the body mass index scale, originally called the Quetelet Index. See Related Links for an alternative explanation to the colors featured above.
Assateague Island is a 37-mile (60 km) long barrier island located off the eastern coast of the Delmarva Peninsula facing the Atlantic Ocean. The northern two-thirds of the island is in Maryland while the southern third is in Virginia. It's known in particular for the ponies that inhabit it, and once a year in late July, some are rounded up and encouraged to swim across to Chincoteague, Virginia to be sold at auction to benefit the Chincoteague Volunteer Fire Company.
Photo Details: Top - Camera: OLYMPUS DIGITAL CAMERA SP-100EE; Exposure Time: 0.0025s (1/400); Aperture: ƒ/5.0; ISO equivalent: 125; Focal Length (35mm): 88. Bottom - Camera: Motorola Moto G (5) Plus; Exposure Time: 0.0011s (1/950); Aperture: ƒ/1.7; ISO equivalent: 64; Focal Length: 4.3mm.
Assateague Island, Virginia Coordinates: 37.901889, -75.360031
Related Links
Alternative Explanation for the Iridescent Colors
Non Petroleum Sheens on Water
Dog and Pony Show
John's Webpage
Student Links
What are barrier islands?
Why is the sky blue?
Earth Observatory
Assateague and Chincoteague Islands, Virginia