Catch ISS and Endeavour in Baltimore pass
If skies are clear overnight, Marylanders may be able to catch the International Space Station and the shuttle Endeavour as they fly almost directly over Baltimore. It may be the last chance any of us ever gets to see a space shuttle in flight. After Endeavour, only one more flight is scheduled - Atlantis, in July.
Unfortunately, it will mean some lost sleep.
Look for the pair to appear almost directly overhead at 3:38 a.m. Tuesday morning. Because they will be passing over well before sunrise, they will not be in a position to reflect sunlight until they are high overhead. But they should appear, one after the other, just east of the zenith (straight up), in the middle of the constellation Cygnus, the Swan.
I'm not sure, at this writing, which will appear first - the ISS or Endeavour. But hedge your bets and be outside a minute or two early, just in case, and stick around a minute or two after the first goes by. The ISS will be by far the brighter of the two.
From there. Endeavour and the ISS will head northeast, disappearing at 3:41 a.m. as they pass over Nova Scotia. The shuttle is scheduled to land at the Kennedy Space Center in Florida on Wednesday.