For centuries, ships navigated by the stars. Thousands of ships' logs representing hundreds of thousands of position readings were diligently recorded by sailors for a future use they never could have imagined: 100 years of ocean travel 1750 to 1850.
posted by stbalbach
on Apr 15, 2012 -
is a skill pretty much taken for granted now, but it wasn't
. Accurate maps were once prized state secrets, laborious efforts that cost a fortune and took years (or even decades) to complete.
How things have changed. (Yours now, $110
) It took almost 500 years to map North America, but it's only taken one tenth of that to map just everything else. In the last 50 years, we've been able to create acurate atlases of two planets
and one moon
(with a second
in the works). Actually, we've done a lot more than that
. We're actually running out of things to map.
posted by absalom
on Jan 27, 2005 -
MSNBC's Robert Wright seemes confused
in this story about the Global Positioning System. He misinforms the reader about how terrorists can now use the military's encrypted GPS signals for more accurate positioning. (FYI: you are still unable to use the military's encrypted GPS signals, contrary to what Wright claims.) more inside>>
posted by darainwa
on Jun 28, 2000 -