June 5, 2012 Less than 250 years ago, the brightest minds of the Enlightenment were stumped over how far the Earth is from the sun. The transits of the 1760s helped answer that question, providing a virtual yardstick for the universe.
June 4, 2012 Do not stare at the sun! That's the first "tip" from all the experts. Instead, make a trusty "pinhole camera" or get hold of some No. 14 welder's goggles.