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When drivers are preparing to race, they move the vehicle and interrupt light beams 7 in (180 mm) behind the starting line. Crossing this beam activates the top half of the blue lights; on typical trees, which were used at national events prior to April 2011, and still used for regional and club events, this is the top set of two small amber bulbs, labelled "Pre-Stage".
The plan for the flight was conceived by the Air Service's Assistant Chief, Brig. Gen. Billy Mitchell in 1923. The Air Service since 1919 had been regularly establishing endurance, distance, altitude and speed records in airplanes to promote favorable publicity and public support for the funding of the U.S. Army War Department's Major Project Number 4, the Lassiter plan for the expansion of ...
Crepuscular rays are noticeable when the contrast between light and dark is most obvious. Crepuscular comes from the Latin word crepusculum, meaning "twilight". [2] Crepuscular rays usually appear orange because the path through the atmosphere at dawn and dusk passes through up to 40 times as much air as rays from a high Sun at noon.
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Dawn to Dusk may refer to: Dawn to Dusk, the first disc of the album Mellon Collie and the Infinite Sadness by The Smashing Pumpkins "Dawn to Dusk", a song from the Raga soundtrack; Dawn-to-dusk transcontinental flight across the United States, an aviation record established in 1924
Matutinal animals are active only after dawn, and vespertine only before dusk. A number of factors affect the time of day an animal is active. Predators hunt when their prey is available, and prey try to avoid the times when their principal predators are at large. The temperature may be too high at midday or too low at night. [2]
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