51�Թ�

“Astronavigation is an interesting job,” Suraya said.

But unless some future space-cleaning agency removes it as a menace to astronavigation, Vanguard II itself will probably orbit silently for at least a century.

The increasing complexity of astronavigation has fostered the development of swifter and smaller computers that find no end of applications on earth.

The cardinal principle of astronavigation is to keep far away from gravitational maelstroms.

The best way to visualize space in terms of astronavigation is to think of it as a placid lake with a few widely separated whirlpools in its mirror surface.