This is off the beaten track for this group, so I apologize beforehand for this posting. But, since you guys can calculate orbital elements from a simple visual observation this math ought to be easy enough for you. I'm wondering, since Shannon Lucid spent 6 months or so traveling at 5 miles per second, how much did time slow down for her as compared to her earthbound neighbors? I'm not asking this from a "teacher" point of view where I already know the answer. I'm truely curious. Many regards, Randy Parker Dallas, Texas