andrew wilder from the u.s. in the substitute for peace and nick schifrin, thank you both. >> thank you. >> woodruff: people gathered across the country for a historic event today, a total eclipse of the sun in a 70 mile- wide band, crossing from the pacific to the atlantic coasts. with special eyeglasses or homemade boxes, tens of millions looked to the sky to witness a sight not seen in most people's lifetimes. our science correspondent, miles o'brien, was in idaho to watch for us and in partnership with our colleagues from the pbs program, "nova." miles gets us started and then, he and william brangham discuss the day's celestial and earthly events. >> reporter: it is the first coast to coast american eclipse in a century. millions had front row seat for a celestial minuet of moon and sun. >> we got to charleston yesterday morning and came up because this was in our path and we could come and when you can, you should, so we came to see the eclipse because it's a once-in-a-lifetime deal. >> i'd never seen an e