, , or (the phrase in
Portuguese
Portuguese may refer to:
* anything of, from, or related to the country and nation of Portugal
** Portuguese cuisine, traditional foods
** Portuguese language, a Romance language
*** Portuguese dialects, variants of the Portuguese language
** Portu ...
means literally 'turn of the sea' but also 'return from the sea') is a navigational technique perfected by
Portuguese
Portuguese may refer to:
* anything of, from, or related to the country and nation of Portugal
** Portuguese cuisine, traditional foods
** Portuguese language, a Romance language
*** Portuguese dialects, variants of the Portuguese language
** Portu ...
navigators during the
Age of Discovery
The Age of Discovery (or the Age of Exploration), also known as the early modern period, was a period largely overlapping with the Age of Sail, approximately from the 15th century to the 17th century in European history, during which seafarin ...
in the late fifteenth century, using the dependable phenomenon of the great permanent wind circle, the
North Atlantic Gyre
The North Atlantic Gyre of the Atlantic Ocean is one of five great oceanic gyres. It is a circular ocean current, with offshoot eddies and sub-gyres, across the North Atlantic from the Intertropical Convergence Zone (calms or doldrums) to the part ...
. This was a major step in the
history of navigation
The history of navigation, or the history of seafaring, is the art of directing vessels upon the open sea through the establishment of its position and course by means of traditional practice, geometry, astronomy, or special instruments. Many p ...
, when an understanding of
winds in the age of sail
The captain of a steam ship naturally chooses the shortest route to nearby destinations. Since a sailing ship is usually pushed by winds and currents, its captain must find a route where the wind will probably blow in the right direction. Tackin ...
was crucial to success: the European
sea empires would not have been established without an understanding of the
trade wind
The trade winds or easterlies are the permanent east-to-west prevailing winds that flow in the Earth's equatorial region. The trade winds blow mainly from the northeast in the Northern Hemisphere and from the southeast in the Southern Hemisph ...
s.
History
Portuguese discovery in the Atlantic Ocean
The was a sailing technique discovered in successfully returning from the
Atlantic islands
This is a list of islands in the Atlantic Ocean, the largest of which is Greenland. Note that the definition of the ocean used by the International Hydrographic Organization (IHO) excludes the seas, gulfs, bays, etc., bordering the ocean itself. ...
, where the pilot first had to sail far to the west in order to catch usable following winds, and return to Europe. This was a counter-intuitive sailing direction, as it required the pilot to steer in a direction that was perpendicular to the ports of
Portugal
Portugal, officially the Portuguese Republic ( pt, República Portuguesa, links=yes ), is a country whose mainland is located on the Iberian Peninsula of Southwestern Europe, and whose territory also includes the Atlantic archipelagos of ...
. Lack of this information may have doomed the 13th-century expedition of
Vandino and Ugolino Vivaldi
__NOTOC__
Vandino (sometimes Vadino or Guido) and Ugolino Vivaldi (sometimes Ugolino de Vivaldo) (fl. 1291) were two brothers and Genoese explorers and merchants who are best known for their attempted voyage from Europe to India via Africa. Th ...
, who were headed towards the
Canary Islands
The Canary Islands (; es, Canarias, ), also known informally as the Canaries, are a Spanish autonomous community and archipelago in the Atlantic Ocean, in Macaronesia. At their closest point to the African mainland, they are west of Morocc ...
(as yet unknown by the Europeans) and were lost; once there, without understanding the Atlantic gyre and the , they would have been unable to beat upwind to the
Strait of Gibraltar
The Strait of Gibraltar ( ar, مضيق جبل طارق, Maḍīq Jabal Ṭāriq; es, Estrecho de Gibraltar, Archaic: Pillars of Hercules), also known as the Straits of Gibraltar, is a narrow strait that connects the Atlantic Ocean to the Medi ...
and home. Discovering this technique was crucial for returning from future
discoveries; for example
Christopher Columbus
Christopher Columbus
* lij, Cristoffa C(or)ombo
* es, link=no, Cristóbal Colón
* pt, Cristóvão Colombo
* ca, Cristòfor (or )
* la, Christophorus Columbus. (; born between 25 August and 31 October 1451, died 20 May 1506) was a ...
would never have returned from the Americas without applying the by sailing northwards from the
Caribbean
The Caribbean (, ) ( es, El Caribe; french: la Caraïbe; ht, Karayib; nl, De Caraïben) is a region of the Americas that consists of the Caribbean Sea, its islands (some surrounded by the Caribbean Sea and some bordering both the Caribbean Se ...
through the
Horse Latitudes
The horse latitudes are the latitudes about 30 degrees north and south of the Equator. They are characterized by sunny skies, calm winds, and very little precipitation. They are also known as subtropical ridges, or highs. It is a high-pressure ...
to catch the prevailing mid-latitude
westerlies
The westerlies, anti-trades, or prevailing westerlies, are prevailing winds from the west toward the east in the middle latitudes between 30 and 60 degrees latitude. They originate from the high-pressure areas in the horse latitudes and trend to ...
.
Similarly in the South Atlantic with the exception that the South Atlantic gyre circulates counterclockwise. As India-bound Portuguese explorers and traders crossed the
equator
The equator is a circle of latitude, about in circumference, that divides Earth into the Northern and Southern hemispheres. It is an imaginary line located at 0 degrees latitude, halfway between the North and South poles. The term can als ...
with the intention of passing the entire western coast of Africa, their voyages took them far to the West (in the vicinity of
Brazil
Brazil ( pt, Brasil; ), officially the Federative Republic of Brazil (Portuguese: ), is the largest country in both South America and Latin America. At and with over 217 million people, Brazil is the world's fifth-largest country by area ...
.)
Application to the Pacific Ocean – the Manila Galleon
The route of the
Manila Galleon
fil, Galyon ng Maynila
, english_name = Manila Galleon
, duration = From 1565 to 1815 (250 years)
, venue = Between Manila and Acapulco
, location = New Spain (Spanish Empire) ...
from
Manila
Manila ( , ; fil, Maynila, ), officially the City of Manila ( fil, Lungsod ng Maynila, ), is the capital of the Philippines, and its second-most populous city. It is highly urbanized and, as of 2019, was the world's most densely populate ...
to
Acapulco
Acapulco de Juárez (), commonly called Acapulco ( , also , nah, Acapolco), is a city and major seaport in the state of Guerrero on the Pacific Coast of Mexico, south of Mexico City. Acapulco is located on a deep, semicircular bay and has bee ...
depended upon successful application of the Atlantic phenomenon to the
Pacific ocean
The Pacific Ocean is the largest and deepest of Earth's five oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean (or, depending on definition, to Antarctica) in the south, and is bounded by the continen ...
: in discovering the
North Pacific Gyre
The North Pacific Gyre (NPG) or North Pacific Subtropical Gyre (NPSG), located in the northern Pacific Ocean, is one of the five major oceanic gyres. This gyre covers most of the northern Pacific Ocean. It is the largest ecosystem on Earth, locate ...
, captains of returning galleons had to reach the latitudes of
Japan
Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...
before they could safely cross. The discovery, upon which the Manila-Acapulco galleon trade was based was owing to the Spanish
Andrés de Urdaneta
Andrés de Urdaneta (1508 – June 3, 1568) was a maritime explorer for the Spanish Empire of Basque heritage, who became an Augustinian friar. At the age of seventeen, he accompanied the Loaísa expedition to the Spice Islands where he sp ...
, who, sailing in convoy under
Miguel López de Legazpi, discovered the return route in 1565: the fleet split up, some heading south, but Urdaneta reasoned that the trade winds of the Pacific might move in a
gyre
In oceanography, a gyre () is any large system of circulating ocean currents, particularly those involved with large wind movements. Gyres are caused by the Coriolis effect; planetary vorticity, horizontal friction and vertical friction dete ...
as the Atlantic winds did. If, in the Atlantic, ships made the to the west to pick up winds that would bring them back from
Madeira
)
, anthem = ( en, "Anthem of the Autonomous Region of Madeira")
, song_type = Regional anthem
, image_map=EU-Portugal_with_Madeira_circled.svg
, map_alt=Location of Madeira
, map_caption=Location of Madeira
, subdivision_type=Sovereign st ...
, then, he reasoned, by sailing far to the north before heading east, he would pick up the westerlies to bring him back to the
west coast of North America
The human history of the west coast of North America is believed to stretch back to the arrival of the earliest people over the Bering Strait, or alternately along a now-submerged coastal plain, through the development of significant pre-Columbi ...
. Though he sailed to
38 degrees North before turning east, his hunch paid off, and he hit the coast near
Santa Catalina Island, California, then followed the coast south to
Acapulco
Acapulco de Juárez (), commonly called Acapulco ( , also , nah, Acapolco), is a city and major seaport in the state of Guerrero on the Pacific Coast of Mexico, south of Mexico City. Acapulco is located on a deep, semicircular bay and has bee ...
. Most of the crew was suffering from scurvy and only 18 remained strong enough to sail the ship.
[Kelsey p. 119]
Notes
References
*
*
*
Portuguese
*
*
{{DEFAULTSORT:Volta Do Mar
Portuguese exploration in the Age of Discovery
Age of Sail
History of the Atlantic Ocean
History of the Pacific Ocean
Maritime history of Portugal
Navigation
Portuguese language