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In navigation, a rhumb line (or loxodrome) is a line crossing all meridians of longitude at the same angle, i.e. That is, upon taking an initial bearing, one proceeds along the same bearing, without changing the direction as measured relative to true or magnetic north.
Most modern navigation relies primarily on positions determined electronically by receivers collecting information from satellites.
The eastward route across the Pacific, also known as the tornaviaje (return trip) was only discovered forty years later, when Spanish cosmographer Andrés de Urdaneta sailed from the Philippines, north to parallel 39°, and hit the eastward Kuroshio Current which took its galleon across the Pacific. The term stems from the 1530s, from Latin navigationem (nom. of navigare "to sail, sail over, go by sea, steer a ship," from navis "ship" and the root of agere "to drive".
The fleet of seven ships sailed from Sanlúcar de Barrameda in Southern Spain in 1519, crossed the Atlantic Ocean and after several stopovers rounded the southern tip of South America.
Some ships were lost, but the remaining fleet continued across the Pacific making a number of discoveries including Guam and the Philippines.
based on the principle of the archipendulum used in constructing the Egyptian pyramids.
Open-seas navigation using the astrolabe and the compass started during the Age of Discovery in the 15th century.
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Longitude can be calculated if the precise time of a sighting is known.