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In page Pytheas:
"Today the elevation can be obtained easily on ship with a quadrant. Electronic navigational systems have made even this simple measure unnecessary. Longitude was beyond Pytheas and his peers, but it was not of as great a consequence, because ships seldom strayed out of sight of land. East–west distance was a matter of contention to the geographers; they are one of Strabo's most frequent topics. Because of the gnōmōn north–south distances were accurate often to within a degree.[citation needed]
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