There are 10 references cited in this article, which can be found at the bottom of the page. Levy is also a NauticEd Level V Captain Rank Chief Instructor, an American National Standards Assessor, an SLC instructor, an ASA (American Sailing Association) Certified Instructor Bareboat Chartering, and an Israeli licensed skipper on Boats for International Voyages. Coast Guard Licensed Master of vessels up to 50 Tons with Auxiliary Sail and Assistance Towing Endorsements. Levy has over 20 years of sailing experience and has sailed in many places around the world including: the Atlantic Ocean, the Mediterranean Sea, The Caribbean, and the Indian Ocean. Captain Nitzan Levy is a Sailor, Social Entrepreneur, and the Founder of Sailors NYC, a recreational sailors’ club based in Jersey City, New Jersey that specializes in cruising boats and a variety of community programs. It was not until 1992 that Pope John Paul II described Galileo’s conviction by the Inquisition as a “painful misunderstanding”.This article was co-authored by Nitzan Levy. In the centuries that followed, the Dialogue became a symbol of Galileo’s commitment to the freedom of scientific thought. Worse still: Although the Roman censor had initially authorised the printing of the Dialogue, in late 1632, Galileo was accused of having contravened the anti-Copernican Decree of 1616 with this publication. The scientist was ordered to deny Copernican teachings and was condemned to lifelong house arrest. Nonetheless, he published the Dialogue - and doubts were quickly expressed about his theory of the tides. In any case, Galileo did not find any conclusive explanation for the regularity with which high and low tide recur at a delay of around 50 minutes day by day. He assumes that this Earth pendulum swings back and forth in six hours and examines whether this assumption can be reconciled with the quantifiable period of oscillation of a ten-metre-long pendulum, for example a swinging light that hangs from the ceiling of a church.Īs the manuscripts show, his attempt to extrapolate the period of the tides through the comparison with a pendulum came to nothing. The National Library in Florence houses a 200-page-thick bundle of manuscripts containing Galileo’s notes on questions concerning motion, including calculations, tables and sketches.Īn unusual thought experiment can be found on page 154r: Galileo imagines a gigantic pendulum, the length of which corresponds to the Earth’s radius. To establish how the water flows backwards and forwards in the sea basins, he adopted the comparison with a giant pendulum. The student of nature elaborated further. Between these points, the seawater is either accelerated or decelerated, just like the water in the barge. The opposite happens on the side facing the Sun, he argued. Because the direction of rotation of the Earth’s annual and daily movements are the same, their speeds accumulate on the side of the Earth turned away from the Sun. But by which means?Īs a staunch Copernican, Galileo had an explanation at hand: the tides are propelled by the dual motion of the Earth around the Sun and on its own axis. Accordingly, in Galileo’s view, high and low tides could result from the forward and backward flow of water in sea basins when the latter are decelerated or accelerated. And thereafter slosh forward and back for some time. Together with his friend Paolo Sarpi, Galileo had observed what happens when the barges that transported freshwater to Venice were brought to a sudden halt for docking: “keeping its impetus”, the water in the hull – as opposed to the boat itself – “will run forward toward the prow where it will rise perceptibly”.
In his explanation of the tides, he believed that he had finally confirmed that the Copernican view was correct: his theory of the tides also rounded off the arguments in support of Copernicus, which he presented in his controversial work Dialogue Concerning the Two Chief World Systems in 1632. After the discoveries he made with his telescope, Galileo Galilei embarked on an increasingly urgent quest for proof of the Copernican worldview, which placed the Sun rather than the Earth at the centre of the universe.
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