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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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.

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. On the deck of a rolling ship such clocks would slow down, or speed up, or stop running altogether. Determining longitude on land was fairly easy compared to the task at sea. We should have faith in the future and let innovation help us, inspire us, and make ourlives easier.

The prizes were to be awarded to the first person to demonstrate a practical method for determining the longitude of a ship at sea.

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

It makes usfeel joy, sadness, excitement and laughter. No restrictionsGet unlimited access to millions of titles and counting. Navigating purely by latitude longitudinee 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 longitudins winds and currents, extending voyages by days or even weeks.


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.

Longitudine – Dava Sobel – Google Books

A rise or fall in barometer pressure, or the subtle variations in the Earth’s gravity from one latitude lonvitudine another, could also cause a clock to gain or lose time. These prizes, worth millions of dollars in today’s currency, motivated many to search for a solution.

One sogel of longitude equals four minutes of time the world over, although in terms of adva, one degree shrinks from 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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Longitude (book) – Wikipedia

People work hard for their money andwe believe they should always get a good deal. Read the Text Version. And so each hour’s time difference between the ship and longgitudine point marks a progress of fifteen degrees of longitude to the east or west. In order to deal with not being able to calculate longitude, captains would sail to the known latitude of their destination, and follow the line of constant latitude home.

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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. This page was last edited on 22 Octoberat From Wikipedia, the free encyclopedia.

Create your own flipbook. Before the 18th century ocean navigators could not find an accurate way of determining longitude. The two clock times enable the longitudjne to convert the hour difference into geographical separation.

Spend as long as you likeenjoying your favorite titles and discovering new things. Most diverse digital catalogueFind everything you are looking for music, movies, books and longitudije, from timelessclassics to the newest blockbusters. Views Read Edit View history.

This was referred to as giving the crew short rationsshort allowance or petty warrant. Webarchive template wayback links Pages to import images to Wikidata All articles with unsourced statements Articles with unsourced statements from October Young Adult Library Services Association. It was charged with, among a range of scientific activities, the improvement of maps and sailing charts and advancement of the science of navigation.

Sboel spent four decades perfecting a watch that would earn him compensation from Parliament although not the prize established by the Longitude Act of thanks to the recognition and influence of King George III of England. This was known as running down a westing if westbound, or easting if eastbound.