Dava Sobel was born in the Bronx, New York on June 15, She received a B.A. from the State University of New York at Binghamton in She is a. Title, Longitudine Saggi stranieri. Author, Dava Sobel. Translated by, Gianna Lonza. Publisher, Rizzoli, ISBN, , Length, Longitudine – Music. Dava Sobel Format: Audio CD. Be the first to review this item Dava Sobel Store. › Visit Amazon’s Dava Sobel Store.

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Due to the international effort in solving the problem and the scale of the enterprise, it represents one of the largest scientific endeavours in history. This was known as running down a westing if westbound, or easting if eastbound.

Read the Text Version. Reprinted by arrangement with Walker and Company. Unlimited means no restrictions andendless possibilities. By using this site, you agree to the Terms of Use and Privacy Policy. Published in Penguin Books Determining longitude on land was fairly easy compared to the task at sea. One degree of longitude equals four minutes of time the world over, although in terms of distance, one degree shrinks from It was charged with, among a range of scientific activities, the improvement of maps and sailing charts and advancement of the science of navigation.

Retrieved from ” https: Holland added to the effort with a prize offered in This increased the likelihood of short rations, [5] scurvy or starvation leading to poor health or even death for members of the crew and resultant risk to the ship. Before the 18th century ocean navigators could not find an accurate way of determining longitude.

Determining latitude was relatively easy in that it could be found from the altitude of the sun at noon with the aid of a table giving the sun’s declination for the day.

Scaricare Longitudine Dava Sobel PDF Pages 1 – 5 – Text Version | FlipHTML5

People work hard for their money andwe believe they should always get a good deal. The book was made into a television series entitled Longitude. Motivated by a number of maritime disasters attributable to serious errors in reckoning position at sea, particularly spectacular disasters such as the Scilly naval disaster of which took Admiral Sir Cloudesley Shovell and four ships of his fleet, the British government established the Board of Longitude in Britain was not alone in the desire to solve the problem.


A rise or fall in barometer pressure, or the subtle variations in the Earth’s gravity from one latitude to another, could also cause a clock to gain or lose time. A stable surface to work from, known coordinates to refer to, a sheltered environment for the unstable chronometers of the day, and the ability to repeat determinations over time made for great accuracy.

Once out of sight of land, longitude became impossible to calculate, which sometimes led to tragedies in stormy or foggy conditions.

We should not be restrained by conventions in the present. By bringing all entertainment sobrl one product, we are able to provide a huge variety of titles for cheaper – and aservice that is truly worth paying for. Anyone, anytime, anywhereEasy to use and compatible with virtually any web-enabled device, Playster is essentialfor families needing different things for different people.

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Each prize, in increasing amounts, was for solutions of increasing accuracy. Most diverse digital catalogueFind everything you are looking for music, movies, books and games, from timelessclassics to the newest blockbusters.

We should have faith in the future and let innovation help us, inspire us, and make ourlives easier. For calculating longitude at sea however, early ocean navigators had to rely on dead reckoningwhich involves triangulating several bearings of the same land feature from different positions. Normal changes of temperature encountered en route from a cold country of origin to a tropical trade zone thinned or thickened a clock’s lubricating oil and made its metal parts expand or contract with equally disastrous results.

We believe in all experiences and all perspectives. Precise knowledge of the hour in two different places at once – a longitude prerequisite so easily accessible today from any pair of cheap wristwatches – was utterly unattainable up to and including the era of pendulum clocks.


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DAVA SOBEL, Longitudine, Milano, Rizzoli, 1996, 153 pp. Lit. 22.000.

As Dava Sobel explains, “to know one’s longitude at sea, one needs to know what time it is aboard ship and also the time at the home port or another place of known longitude-at that very same moment. The two clock times enable the navigator to convert the lonvitudine difference into geographical separation.

On the deck of a rolling ship such clocks would slow down, or speed up, or stop running altogether.

Latitude can also be determined from night sightings of Polaristhe northern pole star. View in Fullscreen Report. Create your own flipbook. Every day at sea, when the navigator resets his ship’s clock to local noon when the sun reaches its highest point in the sky, and then consults the home port clock, every hour’s discrepancy between them translates into another fifteen degrees of longitude.

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The best scientists of the time, including Longtiudine Isaac Newtonthought it impossible. Young Adult Library Services Association. This was referred to lonhitudine giving the crew short rationsshort allowance or petty warrant. Navigating purely by latitude was of course vulnerable if the sun was clouded over at noon, and caused problems as it prevented ships from taking the most direct route, a great circleor a route with the most favourable winds and currents, extending voyages by days or even weeks.

The prizes were to be awarded to the first person to demonstrate a practical method for determining the longitude of a ship at sea. Wobel John Harrison stands his pendulum clock while his H4 watch lies to his right on the table.