Word: discs
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Dates: during 1970-1979
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...here, the moon's disc will seem to touch the right hand edge of the sun and slowly cover most of the sun. At mid-eclipse in Cambridge, a thin crescent of sunlight will remain above the black moon. Clouds will take on a sunset appearance, and the shadow of totality, traveling at over 1000 miles per hour, may be visible from some offshore islands...
...totality approaches on Nantucket, the "Diamond Ring Effect" should be visible. A thin circle of light, capped by one bright spot, surrounds the moon's black disc and creates the impression of a ring. About this time, ripples of light (the so-called shadow bands) may race across the landscape as sunlight is refracted by irregularities in the earth's upper atmosphere...
ANNULAR and partial eclipses of the sun are not very interesting to scientists because the remaining two or three per cent of the ?? disc completely drowns out the coro?-a halo that is 500,000 times fain??er than the rest of the sun. It is possible to study the corona without an ??clips by using a coronagraph-a met?? disc held in front of telescope to create an artificial eclipse. However, interplanetary dust and sunlight scattered in the upper atmosphere obliterate the corona's fine details...
...past, eclipse observations have uncovered some important facts about the sun. For instance, after comparing the corona's shape and intensity from eclipse to eclipse, nineteenth century astronomers realized that ?? changed over an ?? The element helium ?? usual ionized states ?? also first detected from ?? corona's light. The disc??? ions, such as Iron??????? led to a remark ?? corona's tempera ??? reach at least ?? ?? heit in order to pro? ?? When parties are ?? sun they pro? ?? shock waves ?? these...
...Harvard College Observatory's Orbiting Solar Observatory VI (OSO-VI) will take simultaneous ultra-violet observations of the sun's visible disc and corona during the rocket launch...