Such a line to guide perhaps round pole?

Usage examples of longitude.

Could it have been from one of these sources that he derived his accurate longitudes?

Oronteus Finaeus World Map also commands attention: it successfully places the coasts of Antarctica in correct latitudes and relative longitudes and finds a remarkably accurate area for the continent as a whole.

Total longitude between Gibraltar and the Sea of Azov is accurate to half a degree, while across the map as a whole average errors of longitude are less than a degree.

Layer upon layer, the cumulative effect of his painstaking and detailed analysis is to suggest that we are deluding ourselves when we suppose that accurate instruments for measuring longitude were not invented until the eighteenth century.

It is clear, too, that they had an instrument of navigation for accurately determining longitudes that was far superior to anything possessed by the peoples of ancient, medieval or modern times until the second half of the eighteenth century.

Then my eyes fell upon the vast planisphere spread upon the table, and I placed my finger on the very spot where the given latitude and longitude crossed.

We asked for and got a transpolar orbit on the twenty west, one-sixty east longitude.

A second is also in Bihar, at the same longitude as Asansol, but north of the Ganges River.

The earliest known maps of the mediaeval epoch present the appearance of rough delineations of land and water, a corrupted nomenclature, and no reference whatsoever to degrees of longitude or latitude.

But after Mercator it became possible for navigators to make use of latitude and longitude when plotting their courses.

In so doing the accuracy of his work declined: instruments capable of finding longitude did not exist in 1569, but appear to have been used to prepare the ancient source documents Mercator consulted to produce his 1538 map.

The proof of this is that if the Atlantic Island had 2300 leagues of longitude, and the distance of Cadiz to the mouth of the river Maranon or Orellana and Trinidad, on the coast of Brazil, is, not more than 1000, 900, or 1100 leagues, being the part where this land joined to America, it clearly appears that, to complete the complement of 2300 leagues, we have to include in the computation all the rest of the land from the mouth of the Maranon and Brazil to the South Sea, which is what they now call America.

Or why, irrespective of all latitudes and longitudes, does the name of the White Sea exert such a spectralness over the fancy, while that of the Yellow Sea lulls us with mortal thoughts of long lacquered mild afternoons on the waves, followed by the gaudiest and yet sleepiest of sunsets?

Moreover, these antagonist kingdoms, Tartarean and Elysian, defined as the everlasting habitations of departed souls, have been successively driven, as dissipated visions, from their assumed latitudes and longitudes, one after another, by progressive discovery, until now the intelligent mind knows of no assignable spot for them.

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.