[C150.Ebook] PDF Ebook Night Sky with Exit Wounds By Ocean.

Posted by 2018  •  article

When Daylight Saving Time ends – for 2017, that's Sunday, Nov. 5 – many people will find themselves spending more time driving in the dark. Depth perception, color recognition and peripheral vision can be compromised in the dark, and the glare of headlights from an oncoming vehicle can temporarily blind a driver.

Night vision is the ability to see well in low-light conditions. As we age, we have greater difficulty seeing at night. A 50-year-old driver may need twice as much light to see as well as a 30-year-old. At age 60 and older, driving can become even more difficult , according to the American Optometric Association. Some older drivers also may have compromised vision due to cataracts and degenerative eye diseases.

A National Sleep Foundation poll says 60% of adults have driven while they were tired, and another 37%, or 103 million people, have fallen asleep at the wheel . Of those, 13% say they fall asleep while driving at least once a month, and 4% say they have caused a crash by falling asleep while driving.

Night or nighttime ( sp. night-time or night time ) is the period of time between sunset and sunrise , when the Sun is below the horizon . Complete darkness or astronomical night is the period between astronomical dusk and astronomical dawn when the Sun is between 18 and 90 degrees below the horizon and does not illuminate the sky. As seen from latitudes between 48.5° and 66.5° north or south (of the Equator ), complete darkness does not occur around the summer solstice because although the Sun sets, it is never more than 18° below the horizon at lower culmination .

The opposite of night is day (or " daytime ", to distinguish it from "day" referring to a 24-hour period). The start and end points of time for a night vary, based on factors such as season , latitude , longitude , and time zone . Twilight is the period of night after sunset or before sunrise when the Sun still illuminates the sky when it is below the horizon. At any given time, one side of Earth is bathed in sunlight (the daytime) while the other side is in the shadow caused by Earth blocking the sunlight. The central part of the shadow is called the umbra .

Natural illumination at night is still provided by a combination of moonlight , planetary light , starlight , zodiacal light , gegenschein , and airglow . In some circumstances, aurorae , lightning , and bioluminescence can provide some illumination. The glow provided by artificial lighting is sometimes referred to as light pollution because it can interfere with observational astronomy and ecosystems .

When Daylight Saving Time ends – for 2017, that's Sunday, Nov. 5 – many people will find themselves spending more time driving in the dark. Depth perception, color recognition and peripheral vision can be compromised in the dark, and the glare of headlights from an oncoming vehicle can temporarily blind a driver.

Night vision is the ability to see well in low-light conditions. As we age, we have greater difficulty seeing at night. A 50-year-old driver may need twice as much light to see as well as a 30-year-old. At age 60 and older, driving can become even more difficult , according to the American Optometric Association. Some older drivers also may have compromised vision due to cataracts and degenerative eye diseases.

A National Sleep Foundation poll says 60% of adults have driven while they were tired, and another 37%, or 103 million people, have fallen asleep at the wheel . Of those, 13% say they fall asleep while driving at least once a month, and 4% say they have caused a crash by falling asleep while driving.


Beyond night-time economy: Affective atmospheres of the.

Posted by 2018  •  article

 
 

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