It is astounding to me the precision with which scientists know the orbits of planetary bodies and the computer modeling capabilities available to allow the design of such an elaborate trajectory for a spacecraft.
EDIT: The engineer in me says that the word “precision” above should be replaced with “accuracy.” Precision refers to repeatability. Accuracy refers to absolute error.
We just watched the “Landing on a Comet” special on Discovery, and was a bit disappointed. They had a lot of background on the mission itself, along with same-day interviews of scientists working on the mission. I thought they would have more on the landing itself.