Today astronomers can calculate the exact path across the globe which the moon's shadow will track during a solar eclipse. As millions encamp for the brief spectacle with mylar glasses, pinhole cameras, binoculars and telescopes, space agency satellites and mountain-top observatories will study the corona, flares and magnetosphere of the sun as the 125-mile wide black patch zooms along the ground at almost 2000 mph. In the year when Britain will be touched by a total solar eclipse for the first time since 1927, Eclipse also shows how astronomer Norman Lockyer named the element Helium from the spectra of the eclipsed sun and how Cambridge don Arthur Eddington gave the first proof of Einstein's General Theory of Relativity from the bending of sunlight during the famous African eclipse of 1919.
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