Millions will turn their eyes skyward on August 21. They’ll be donning special glasses to watch the first total solar eclipse in a century in America. The eclipse -- when the moon blocks the sun’s rays from hitting Earth -- will cut across the mainland United States. Only a narrow path from Oregon to South Carolina will have total darkness, but people across the country will be treated to a partial eclipse. Hotels have sold out in prime viewing spots and Google has distributed more than 2 million eclipse-viewing glasses to libraries across the country. Retired Foothill College astronomy professor Andrew Fraknoi joins us today to talk about the eclipse, how best to see it and his children’s book about eclipses, “When the Sun Goes Dark."