Word: outerness
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...Professor of Practical Astronomy and former director of the Harvard College Observatory, will set up camp in Miahautlan, an Indian village south of Oaxaca. This will be Menzel's 13th eclipse. "The sun has been my specialty, and there is still no better method of observing the sun's outer corona than by watching an actual eclipse," he said...
After skirting the eastern coastline, the umbra will pass over Nantucket Island. The moon's outer shadow, or penumbra, however, will cause a partialeclipse that will be visible from most of North America...
...expedition will carry out three major experiments, all involving the outer corona. This is a tenuous gas, thinner than any man-made vacuum, and heated by two million degrees centigrade. Although the inner part of the corona can be seen through special narrow band filters without an eclipse, a total solar eclipse is essential to study the whole structure, including the outer portion, of the corona...
...devices. The first, a spectrograph, was designed by James G. Baker, associate of the Harvard College Observatory. This instrument. weighing a ton, uses 16-inch mirrors and a four-by-six-inch grating with 15,000 individually ruled lines in each inch. According to Menzel, spectroscopic photographs of the outer corona have never been made with such sophisticated equipment...
...second experiment involves the use of four special television cameras to measure the intensity of polarization of the outer corona in various colors. The third experiment is a repeat of photography carried out for the Harvard astronomers at the 1968 eclipse in Siberia. Pictures of the eclipse will be taken through polarized filters at different angles with a specially designed telescope...