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"Well," I says, "I reckon maybe you've got a chance now to find out whereabouts this balloon is, because as like as not that is one of these lines here, that's on the map, that you call meridians of longitude, and we can drop down and look at its number, and " "Oh, shucks, Huck Finn, I never see such a lunkhead as you. Did you s'pose there's meridians of longitude on the EARTH?"
It lies S. of Cape Breton Island and the eastern part of Nova Scotia between the parallels of 42° 55' and 44° 46' north latitude and the meridians of 59°04' and 62° 35' west longitude. It has a length of 156 miles and a width, including the Middle Ground, of 76 miles. It is about 420 miles E. ½ S. from Boston to the southwestern edge, which means about 48 hours' steaming for the otter-trawl fleet.
For purposes that you will presently understand, books are calculated for certain meridians, or longitudes, as at Greenwich and Paris, and those who use the books calculated for Greenwich, get their chronometers set at Greenwich, and those who use the Paris, get their chronometers set to Paris time.
Although hardly one shell, crab or fish is common to the above-named three approximate faunas of Eastern and Western America and the eastern Pacific islands, yet many fish range from the Pacific into the Indian Ocean, and many shells are common to the eastern islands of the Pacific and the eastern shores of Africa, on almost exactly opposite meridians of longitude.
The traveler, in passing from Texas or Arkansas through southern New Mexico to California, does not, at the present day, encounter the buffalo; but upon all the routes north of latitude 36° the animal is still found between the 99th and 102d meridians of longitude. Although generally regarded as migratory in their habits, yet the buffalo often winter in the snows of a high northern latitude.
Now, on this day, though he had not changed the hands, he found that his watch exactly agreed with the ship's chronometers. His triumph was hilarious. He would have liked to know what Fix would say if he were aboard! "The rogue told me a lot of stories," repeated Passepartout, "about the meridians, the sun, and the moon! Moon, indeed! Moonshine more likely!
The first was the dividing line between Ohio and Indiana; the last one runs through Oregon a little to the west of Portland. On each side of the principal meridian there are marked off subordinate meridians called range Then a true parallel of latitude is drawn, crossing these meridians at right angles. It is called the base line, or standard parallel.
The halibut are not found in great numbers all over the ground, perhaps the best of the fishing being on the rocky and gravelly ridges and slopes included between the meridians of 69° and 80° west longitude. This rocky bottom is rich in food, and the lant and herring are usually plentiful here in their season.
I am the more ready to adopt this change because when the eclipses are to be computed for our own country the change of meridians will be very readily understood by those who make the computation. It may be interesting to say something of the tables and theories from which the astronomical ephemerides are computed. To understand them completely it is necessary to trace them to their origin.
Having two meridians to look after, the form of the American Ephemeris, to be best adapted to the wants both of navigators and astronomers was necessarily peculiar. Had our navigators referred their longitudes to any meridian of our own country the arrangement of the work need not have differed materially from that of foreign ones.
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