When studying navigational instruments, the sextant appears quite early on.Unlike electronic devices such as radar, GPS, or ECDIS, it has the appearance of a truly "old-fashioned navigational ...

An old seafaring instrument could help astronauts on ever more far-flung and perilous missions.

Chronicles the author's first transatlantic voyage, when he learned to navigate using a sextant, and traces how this indispensible navigational tool was used by daring mariners to explore and map the ...