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" ... But imagine being the navigator on a merchant ship in the 1600s. You only have a few tools at your disposal: a sextant, an astronomical almanac containing the positions of the stars each night and your knowledge of spherical trigonometry. Every night you gaze into the heavens, seeking the position of familiar stars (Polaris in the northern hemisphere, lesser-known bodies in the southern), then retreat to your cabin to consult your almanac and make some calculations. Here's the problem, though. Spherical trig requires various multiplications of sines of angles. You would certainly have a table of sines at your disposal as those had been calculated centuries before and you would dutifully sit down to your figuring. ... "
" ... If you are coastal cruising as I often am, it is always important to know, literally, where you are. Over the centuries, sailors figured out their positions by taking bearings from objects on the land that they could then locate on a chart, such as church towers, or lighthouses, or buoys offshore. When out of sight of land, they used a sextant and took bearings from celestial objects to determine their position. Even before sonar depth sounders were available, navigators would also use lead lines to determine the depth of the water as a cross check on where they were. Each tool provides added imput as to where you are. These techniques can be used with care but not exact precision. Even today in the world of satellite based GPS and the fairly exact positioning information it can provide, it is always best to have a paper chart or map and the needed tools in case your electronic ones fail so you are not left stranded and unable to find your way home. ... "
" ... You don’t need a sextant to read between the lines: Pier 1 will probably be looking at bankruptcy or—at the very least—a radical reordering of its operations, up to and including a sale or merger. That’s assuming it can find somebody willing to take a look at what has become yet another retail tragedy. ... "