Apollo 13 prime crew portrait. From left to right are Astronauts James A.
Lovell, Thomas K. Mattingly, and Fred W. Haise in their space suits. On the
table in front of them are (l-r) a model of a sextant, the Apollo 13
insignia, and a model of an astrolabe. The sextant and astrolabe are two
ancient forms of navigation.