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Chronometer (from the Greek, etc.. Χρόνος - «Time" and μετρέω - «measure") - mechanical watches with extremely accurate speed (error is ± 5 seconds per day, [http://onlinestopwatchtimer.weebly.com online timer] while the ordinary hours ± 20 seconds). Designed by British inventor, a watchmaker Harrison in 1734-1768 years, has become an integral part of the timepiece equipment ship. He was used to determine longitude. Longitude can be calculated from the difference between the local time of astronomical events (such as sunrise or sunset), and the time of the astronomical event at the longitude of one of the observatories, such as Greenwich. For the past 250 years, the Harrison chronometer design [http://onlinestopwatchtimer.weebly.com online stopwatch] has changed little (changed manufacturing techniques and materials used.) At present, this timepiece comes First Moscow Watch Factory branded 8MH.

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