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By the 19th century, namely Mr Athens make Marine chronometer, there Buy Panerai Watches have been some watchmaker in the world, try to made a lot of kinds of types of Marine chronometer, harrison H1 – H4 is benchmarking. Marine chronometer in the navigation period, is mainly used to determine the ship’s longitude, at the same time determined by the sextant/observational sun of eight dimensions, can eventually determine the ship’s geographical location. So in the process of determining longitude, rely mainly on the ship’s a Marine chronometer Buy Panerai Watches, to aim at Greenwich, again by another clock to indicate local time, and this time difference can be according to the hna’s almanac, combined with the sun and form the Angle of the horizon, comprehensive locate the observer’s waters. Time it becomes very important, therefore, this also means that Marine chronometer must have accurate travel time, in order to make the captain know more accurate time, just because of jet lag a little deviation, it is possible to make calculation and observations of navigation location, have a great deviation Buy Panerai Watches.