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Right on time - Letters - Letter to the Editor

Science News, Nov 22, 2003 by Michael D. Delano

In the era before global positioning system (GPS) instruments, determining longitude was difficult since it required a fairly accurate clock, in addition to a sextant ("North vs. Northwest: Lewis and Clark diaries provide directional clue," SN: 10/4/03,p. 213). I was under the impression that one of the clocks Lewis and Clark used was Jupiter's moon Io, which would have made them pretty sophisticated navigators.

MICHAEL D. DELANO, BROOKLYN, N.Y.

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The explorers had a good chronometer, but researcher Robert E. Criss says that not much more is known about it because it was auctioned off after the trip. He didn't find any mention in the party's diaries of Jupiter's moon, but the team did rely on Earth's moon for some measurements. K. RAMSAYER

COPYRIGHT 2003 Science Service, Inc.
COPYRIGHT 2003 Gale Group
 

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