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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.
Twilight occurs according to the solar elevation angle θ s, which is the position of the geometric center of the Sun relative to the horizon. There are three established and widely accepted subcategories of twilight: civil twilight (nearest the horizon), nautical twilight, and astronomical twilight (farthest from the horizon).
Dawn Hampton (June 9, 1928 – September 25, 2016) was an American cabaret and jazz singer, saxophonist, dancer, and songwriter. Hampton began her lifelong career as a musical entertainer touring the Midwest as a three-year-old member of the Hampton family's band The Hampton Sisters in the late 1930s.
Blue hour at the Old Cathedral of the Holy Name of Jesus, Bragança in Portugal. The blue hour (from French l'heure bleue; [1] [a] pronounced [lœʁ blø]) is the period of twilight (in the morning or evening, around the nautical stage) when the Sun is at a significant depth below the horizon.
An L-shaped shoal sits in the middle of major shipping lanes just off the coast of Hampton Roads, Virginia, creating a hazard in the 1880s as ships drew more water. The US Lighthouse Board identified the need for a lighthouse in this area in 1887, and, after several economizing changes to the design, construction began in 1890 and was completed ...
Over a 45-years span — between 1975 and 2020 — improvements in cancer screenings and prevention strategies have reduced deaths from five common cancers more than any advances in treatments ...
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