11. Extinction (astronomy), noun. The reduction in the intensity of radiation from a celestial body as it passes through a medium, such as the envelope of gases surrounding the Earth. Ultimately from Latin ex+ stinguere, “to wipe out.” Atmospheric extinction, which is mainly the result of the scattering of light by dust particles and other molecules, is especially obvious at sunset and sunrise—when the low altitude of the sun lengthens the matter-strewn path on which light travels to earthbound observers. Sunlight reddens at these times because longer wavelengths of light are scattered less. There were nights, this northern summer, when the sun spent hours dying. It was the best time of the day.

Jan 11 -

11. Extinction (astronomy), noun. The reduction in the intensity of radiation from a celestial body as it passes through a medium, such as the envelope of gases surrounding the Earth. Ultimately from Latin ex+ stinguere, “to wipe out.” Atmospheric extinction, which is mainly the result of the scattering of light by dust particles and other molecules, is especially obvious at sunset and sunrise—when the low altitude of the sun lengthens the matter-strewn path on which light travels to earthbound observers. Sunlight reddens at these times because longer wavelengths of light are scattered less.


There were nights, this northern summer, when the sun spent hours dying. It was the best time of the day.

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