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[4]

Assuming these data, and availing himself likewise of astronomical observations, by which the position of every place is properly determined, whether with respect to the circles parallel to the equator, or to those which cut these latter at right angles, in the direction of the poles, the geometer measures the region in which he dwells, and [judges of the extent of] others by comparing the distance [between the corresponding celestial signs]. By this means he discovers the distance from the equator to the pole, which is a quarter of the largest circle of the earth; having obtained this, he has only to multiply by four, the result is the [measure of the] perimeter of the globe.

In the same manner as he who takes the measures of the earth, borrows the foundation of his calculations from the astronomer, who himself is indebted to the natural philosopher, so in like manner the geographer adopts certain facts laid down as established by the geometer, before setting forth his description of the earth we inhabit; its size, form, nature, and the proportion it bears to the whole earth. These latter points are the peculiar business of the geographer. He will next enter on a particular description of every thing deserving notice, whether on land or sea; he will likewise point out whatever has been improperly stated by those who have preceded him, especially by those who are regarded as chief authorities in these matters.1

1 From this point Strabo, strictly speaking, commences his exposition of the principles of Geography.

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