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summaryPtolemy was the most influential of Greek astronomers and geographers of his time. He propounded the geocentric theory that prevailed for 1400 years.
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Astronmical measurements and latitudes.
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Prince Henry the Navigator (Dom Henrique) was the son of King João of Portugal, born in 1394. He is most famous for the voyages of discovery that he organised and financed, which eventually led to the rounding of Africa and the establishment of sea routes to the Indies. Henry was also a very devout man, and was Governor of the Order of Christ from 1420 until his death in 1460.
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"In 1513 the Spanish
captain, Ferdinand
Magellan, circumnavigated
the globe through a passage
way at 52° S latitude now
called the Straights of
Magellan." -
Dive and DisciveryMade and comply good observations of ocean currents off the US East Coast.
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British Explorer
He used Astronomy and
figured out Longitudes and
published his findings in the royal Society’s
Philosophical transactions for 1767 -
britannicaU.S. naval officer, pioneer hydrographer, and one of the founders of oceanography.
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Dive and Discover "It was the first expedition organized specifically to gather data on a wide range of ocean features."
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Ocean Explore SOund NAvigation and Ranging—SONAR—is used to find and identify objects in water. It is also used determine water depth (bathymetry). Sonar is applied to water-based activities because sound waves attenuate (taper off) less in water as they travel than do radar and light waves.
Sonar was first used during World War I to detect submarines. By the 1920s, the U.S. Coast and Geodetic Survey—the precursor -
Britannaica"A spherical steel vessel for use in undersea observation, provided with portholes and suspended by a cable from a boat. Built by the American zoologist William Beebe and the American engineer Otis Barton, the bathysphere made its first dives in 1930. On June 11, 1930, it reached a depth of 400 m, or about 1,300 feet, and in 1934, Beebe and Barton reached 900 m, or about 3,000 feet."
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It can be said that Eratosthenes is most widely known as a famous Greek mathematician. What most people probably do not know is that Eratosthenes is not only a famous mathematician but also a well known geographer, astronomer and historian
