The research aims to produce valid information and must use reliable instruments that guarantee accurate and make it quantifiable and possible reproducibility. Allowing the exclusion or at least control prejudice of personal insights and trends that may distort the results.
miércoles, 14 de julio de 2010
The moon takes a bite out of the sun Sunday over the seaside town of Valparaiso, Chile, during a partial solar eclipse. The photographer created the effect by shooting the top part of the picture through a piece of exposed x-ray film.
During a total solar eclipse, the moon passes completely between Earth and the sun, casting a circular shadow over the planet. On the ground, viewers in the full shadow's path—aka the path of totality—see the moon cover the sun's disk for several minutes. Only the sun's faint upper atmosphere, or corona, remains visible.
The full effect of Sunday's total solar eclipse was visible to just a few people along a narrow, 155-mile-wide (250-kilometer-wide) band of the Pacific Ocean. Starting north of New Zealand, the path of the moon's shadow swept over a few remote islands—including the Chilean territory of Easter Island (Isla de Pascua)—and ended over the southernmost tip of South America.
Sky-watchers flocked by the thousands to Polynesian islands or booked passage on cruise ships to see the total solar eclipse. Viewers in Valparaiso, 75 miles (121 kilometers) northwest of Santiago, were among those in the Pacific Basin and in South America able to see a partial eclipse.
One of Easter Island's famous stone statues, or moai, seems to turn its back on the total solar eclipse Sunday, while a woman uses a special filter for safe eclipse viewing. Looking directly at the sun—even during an eclipse—can permanently damage human eyes. Eclipse experts recommend wearing sun-safe glasses and watching the spectacle only for short periods.
Eclipse Hovers Over Patagonia
Photograph courtesy Daniel Fischer
The eclipsed sun seems to hover over the horizon on Sunday, barely lighting the high, snowy plains of Patagonia in southern Argentina.
According to Telus World of Science's Dyer, the moments before and after totality can be just as thrilling as the solar eclipse itself.
"The twilight horizon colors, weird sharp shadows, and other fleeting phenomena [surrounding the eclipse] are so immersive and overwhelming," Dyer told last week.
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