i am looking for the title and author of a poem. (It was read by Alan
Alda on an old ER episode - he attributed it to William Blake, I
think, but that doesn't make sense.)  It refered to a heron, to the
fact that nature doesn't have the forethought to grieve, and contains
the phrase, "the sun blind stars" or perhaps "the sun blinded stars." 
Please tell me how to find out the title and author of this poem. 
Thank you.