Science@NASA says that "maximum beauty" occurs at 7:26PM PST.
...maybe not for the reason you think though:
I can't resist linking to the above article too, thanks to reading about it elsewhere. As John Gruber notes,
U.S. District Judge Florence-Marie Cooper ordered the Navy to put safeguards in place during sonar maneuvers in order to protect marine mammals from needless injury and death. Shortly after that ruling, President Bush issued his "emergency" waiver, attempting to override the court's order. Judge Cooper called the Navy's so-called emergency "a creature of its own making," and reaffirmed that the military can train effectively without needlessly harming whales.