And if you miss it tomorrow or the 27th the shuttle will still be attached on the 3rd & 4th August (undocks on 5th) and will be visible at a more sane hour.
(3rd=18:48:44>18:50:48 4th(twice)=17:42:33>17:43:18 and 19:14:50>19:16:50) The times may vary for your location. Here's the shuttle itinerary
http://www.nasa.gov/returntoflight/c..._timeline.html Of course the big question on everyones lips is whether or not h0ughys wedge will be ready in time......