Personal Narrative Of Travels To The Equinoctial Regions Of America During The Years 1799-1804 - Volume 3 - By Alexander Von Humboldt And Aime Bonpland.
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In both
worlds the rivers of the northern torrid zone attain the greatest
height nearly at the same period.
The Ganges, the Niger, and the
Gambia reach the maximum, like the Orinoco, in the month of August.*
(* Nearly forty or fifty days after the summer solstice.) The Nile is
two months later, either on account of some local circumstances in the
climate of Abyssinia, or of the length of its course, from the country
of Berber, or 17.5 degrees of latitude, to the bifurcation of the
delta. The Arabian geographers assert that in Sennaar and in Abyssinia
the Nile begins to swell in the month of April (nearly as the
Orinoco); the rise, however, does not become sensible at Cairo till
toward the summer solstice; and the water attains its greatest height
at the end of the month of September.* (* Nearly eighty or ninety days
after the summer solstice.) The river keeps at the same level till the
middle of October; and is at its minimum in April and May, a period
when the rivers of Guiana begin to swell anew. It may be seen from
this rapid statement, that, notwithstanding the retardation caused by
the form of the natural channels, and by local climatic circumstances,
the great phenomenon of the oscillations of the rivers of the torrid
zone is everywhere the same. In the two zodiacs vulgarly called the
Tartar and Chaldean, or Egyptian (in the zodiac which contains the
sign of the Rat, an in that which contains those of the Fishes and
Aquarius), particular constellations are consecrated to the periodical
overflowings of the rivers.
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