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Updated: June 12, 2025
But the art of navigation was so far unknown that but little use was made of this voyage; the goods of India, which were all costly and of small weight, were still for the most part carried across the desert on camels' backs, and we may remark that at a later period hardly more than twenty small vessels ever went to India in one year during the reigns of the Ptolemies, and that it was not till Egypt was a province of Rome that the trade-winds across the Arabian Sea were found out by Hippalus, a pilot in the Indian trade.
Later on, a Greek sailor, Hippalus, found out that by using the monsoons at the appropriate times, he could sail direct from Arabia to India without laboriously coasting along the shores of Persia and Beluchistan, and in consequence the Greeks gave his name to the monsoon.
The most westerly of these furrows is interrupted by a crater on this wall, but reappears on the N. side of it, and, after making a detour towards the W. to avoid a little mountain in its path, runs partially round the E. flank of Hippalus A, and then, continuing its northerly course, terminates amid the mountains W. of Agatharchides.
Pliny in the year A.D. 23, devoted the third, fourth, fifth, and sixth books of his Natural History to geography, and in A.D. 50, Hippalus, a clever navigator, discovered the laws governing the monsoon in the Indian Ocean, and taught sailors how they might deviate from their usual course, so as to make these winds subservient to their being able to go to and return from India in one year.
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