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Discovery’s de-orbit burn is roughly 1 hour prior to landing. When that decision is “go” – the rest is up to Sir Isaac Newton and the reaction control system.
The first landing opportunity at Kennedy Space Center is for 09.07 UTC.
Meanwhile back in Aus, some folks were shocked to find out that they had one of the little discussed, 30 or so contingency landing sites NASA has arranged over the years in bilateral agreements.
Better version though, by this lot from Ball-tee-more though...