On August 21, anyone viewing from a narrow path from Oregon to South Carolina will be able to witness one of nature's grandest spactacles — a total eclipse of the sun. It will be the first time a total eclipse has been visible from the contiguous 48 states in nearly 40 years. In this article for NBCnews.com I explain the what, where, and when of the big event — everything you need to know to prepare fopr the big day.
