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Clock used on ships to aid in navigation
A marine chronometer is a precision timepiece that is carried on a ship and employed in the determination of the ship's position by celestial navigation
Marine_chronometer
English clockmaker (1693–1776)
March 1776) was an English carpenter and clockmaker who invented the marine chronometer, a long-sought-after device for solving the problem of how to calculate
John_Harrison
High-precision time piece
term chronometer is also used to describe a marine chronometer used for celestial navigation and determination of longitude. The marine chronometer was
Chronometer_watch
1974 quartz wristwatch
The Omega Marine Chronometer was the first quartz wristwatch ever to be awarded certified status as a marine chronometer. The watch was made by Omega SA
Omega_Marine_Chronometer
Instrument for measuring, keeping or indicating time
A clock or chronometer is a device that measures and displays time. The clock is one of the oldest human inventions, meeting the need to measure intervals
Clock
Topics referred to by the same term
metronome Chronometer watch, a highly accurate watch Marine chronometer, a timekeeper used for marine navigation, as in Longitude by chronometer Observatory
Chronometer
Swiss watch manufacturer
Model 21 marine chronometers for the US Navy, 1,500 for merchant shipping, and 500 for the US Army during the war. The Model 22 Chronometer Watch followed
Hamilton_Watch_Company
Process of monitoring and controlling the movement of a craft or vehicle
paths, canals and eventually railways. Development of an accurate marine chronometer under John Harrison and others ensured accurate timekeeping for calculating
Navigation
Navigational method
Longitude by chronometer is a method, in navigation, of determining longitude using a marine chronometer, which was developed by John Harrison during
Longitude_by_chronometer
Harrison built a succession of accurate timepieces, introducing the term chronometer. The electric clock, invented in 1840, was used to control the most accurate
History of timekeeping devices
History_of_timekeeping_devices
18th and 19th-century British watchmaker
following John Arnold's earlier work, further simplified the process of marine chronometer production, making them available to the general public. He is also
Thomas_Earnshaw
Type of mechanical watch
synchronized with the ship's marine chronometer. The use of a hack watch makes it easier to take sights, as the chronometer is normally in a fixed position
Hack_watch
English chronometer maker, London, pocket and marine chronometer. George Margetts (1748–1808), English chronometer maker, London, pocket and marine chronometer
List_of_watchmakers
Pivoted support system
unacceptable. The rate of a mechanical marine chronometer is sensitive to its orientation. Because of this, chronometers were normally mounted on gimbals,
Gimbal
Event causing a ship to wreck
techniques available—dead reckoning using the magnetic compass, the marine chronometer (to calculate longitude), a ship's logbook (which recorded the vessel's
Shipwrecking
18th-century French clockmaker
mastery and improvement of the clock and chronograph, above all of the marine chronometer, in which he carried forward the pioneering work of John Harrison
Pierre_Le_Roy
English instrument maker
inventor of the marine chronometer. He was born in Barrow-upon-Humber but moved to London to assist his father in developing the chronometer. In 1761 he sailed
William Harrison (instrument maker)
William_Harrison_(instrument_maker)
Swiss luxury watchmaking company
Switzerland. The company became known for manufacturing highly accurate marine chronometers and complicated precision exclusive timepieces used by over 50 of
Ulysse_Nardin
Time measuring device
seconds per day. The most accurate balance wheel timepieces made were marine chronometers, which were used on ships for celestial navigation, as a precise
Balance_wheel
1970 by Pulsar. In 1974 the Omega Marine Chronometer was introduced, the first wrist watch to hold Marine Chronometer certification, and accurate to 12
History_of_watches
Clock type
quartz watches are chronometer-certified by the COSC. These COSC chronometer-certified movements can be used as marine chronometers to determine longitude
Quartz_clock
American whaler
Kendall K2 marine chronometer by Adams. The K2 was the third precision marine chronometer made after the H4, designed by John Harrison. The chronometer was taken
Mayhew_Folger
Device to measure the passage of time
in London. Not until the 18th century did John Harrison invent a marine chronometer that significantly improved on the stability of the hourglass at sea
Hourglass
A nautical chronometer made by Thomas Earnshaw (1749–1828), and once part of the equipment of HMS Beagle, the ship that carried Charles Darwin on his
Ship's chronometer from HMS Beagle
Ship's_chronometer_from_HMS_Beagle
British watch and clockmaking company
company founded by Edward John Dent in 1814. The firm became known for marine chronometers and standard clocks supplied to observatories and government bodies
Dent_(watchmaker)
Chronometers were formerly used for the accurate determination of longitude by ships at sea. By measuring the time of local solar noon compared to the
List of chronometers on HMS Beagle
List_of_chronometers_on_HMS_Beagle
Navigation using astronomical objects to determine position
other hazards. Practical celestial navigation usually requires a marine chronometer to measure time, a sextant to measure the angles, an almanac giving
Celestial_navigation
Record of humanity's attempts to find east-west position on Earth
transported great distances by ship. John Harrison's invention of a chronometer that could keep time at sea with sufficient accuracy to be practical
History_of_longitude
Physics problem related to laws of motion and gravity
longitude at sea, solved in practice by John Harrison's invention of the marine chronometer. However, the accuracy of the lunar theory was low, due to the perturbing
Three-body_problem
Spring attached to the balance wheel in timepieces
every portable timekeeping device: alarm clocks, kitchen timers, marine chronometers, time-controlled appliances like washing machines, bank vault time
Balance_spring
Swiss watchmaker
regulated by André Brielmann 1974: Omega Marine Chronometer certified as the world's first Marine Chronometer wristwatch, accurate to 12 seconds per year
Omega_SA
Angular distance between the Moon and another celestial body
published in 1763 and used until about 1850 when it was superseded by the marine chronometer. A similar method uses the positions of the Galilean moons of Jupiter
Lunar_distance_(navigation)
1970s–80s watchmaking industry upheaval
1974 Omega introduced the Omega Marine Chronometer, the first quartz watch ever to be certified as a marine chronometer, accurate to 12 seconds per year
Quartz_crisis
Type of watch which uses a clockwork mechanism to measure the passage of time
Chronograph Jewel bearing Quartz watch Railroad chronometers Skeleton watch Tourbillon Marine chronometer ETA SA Lemania Hahn, Ed; et al. (The TimeZone
Mechanical_watch
Type of escapement in mechanical watch movements
of the detent chronometer escapement with a temperature compensated balance, very close rates could be achieved in marine chronometers and to a lesser
Echappement_naturel
Means of calculating position
positions are calculated. Before the 18th-century development of the marine chronometer by John Harrison and the lunar distance method, dead reckoning was
Dead_reckoning
English watchmaker (1790-1853)
famous English watchmaker noted for his highly accurate clocks and marine chronometers. He founded the Dent company. Edward John Dent, son of John and Elizabeth
Edward_John_Dent
British Overseas Territory in the South Pacific
of Independence. Carteret, who sailed without the newly invented marine chronometer, charted the island at 25°02′S 133°21′W / 25.033°S 133.350°W /
Pitcairn_Islands
East-West geographic coordinate
time. While marine chronometers are relatively stable, they are also relatively large and expensive. Prior to the quartz crystal, chronometers were susceptible
Longitude
British chronometer company
Thomas Mercer Chronometers is a British company specialising in the design and production of bespoke chronometers. The story begins with John Harrison
Thomas_Mercer_Chronometers
marine chronometers were developed to a very high degree of accuracy for use in maritime navigation. To test the accuracy of such marine chronometers
Observatory_chronometer
Two-sided strip that coils when heated or cooled
Harrison, an eighteenth-century clockmaker who made it for his third marine chronometer (H3) of 1759 to compensate for temperature-induced changes in the
Bimetallic_strip
Type of watch
or kilometers are most practical and commonplace. Gun chronograph Marine chronometer Mission timer Poljot Strela List of 24-hour watch brands "Chronographs
Chronograph
English horologist
continuously trading firm of chronometer manufacturers in the world. In January 2018, the firm launched a new chronometer wristwatch, after sixteen years
Charles_Frodsham
revolution in Great Britain 1760: Zand dynasty is founded in Iran. 1761: Marine chronometer invented. 1761: Maratha Empire defeated at Battle of Panipat. 1762–1796:
Timeline_of_the_18th_century
English watchmaker and inventor
term "chronometer" into use in its modern sense, meaning a precision timekeeper. His technical advances enabled the quantity production of marine chronometers
John_Arnold_(watchmaker)
American reality television series
determining their restoration costs, as demonstrated by his purchase of a marine chronometer in "Sharks and Cobras", and a barber's chair in "A Shot and a Shave"
Pawn_Stars
Motif produced on the ground; observable only from a height
website an image of a watch and chain inspired by John Harrison's marine chronometer H5 was created. People have used the Strava mobile app and other GPS
Geoglyph
English watchmaker (1938–2009)
in the style of Breguet and a reconstruction of John Harrison's H4 marine chronometer. His development of watches incorporating remontoires that act directly
Derek_Pratt_(watchmaker)
Swiss physicist (1861–1938)
springs that need to be unaffected by varying temperature, such as the marine chronometer. Elinvar is also non-magnetic, which is a secondary useful property
Charles-Édouard_Guillaume
Personal timepiece
one of the world's most accurate wristwatches to date: the Omega Marine Chronometer. Since the technology having been developed by contributions from
Watch
Antiquated adjective epithet of one given to lunacy
method of determining longitude (before John Harrison developed the marine chronometer method of determining longitude, the main theory was the Method of
Lunatic
Brand of Russian wristwatches
the first wristwatches under the brand name "Pobeda" and the first marine chronometers and hack watches or deck watches were produced. By 1951 the production
Poljot
German luxury watch brand
include an up/down power reserve indicator (patent No. 9349), improved chronometer restraints, pocket watch with minutes counter, and addition of beryllium
A._Lange_&_Söhne
British horologist, naval officer, author and radio personality (1890–1948)
to restore the marine chronometers of John Harrison, and this work was completed in 1933. His horological book The Marine Chronometer, its history and
Rupert_Gould
much improved naval Lightning rods John Harrison (1693–1776), UK – marine chronometer Ross Granville Harrison (1870–1959), U.S. – first successful animal
List_of_inventors
Area of geometry, about angles and lengths
sun or stars with respect to the horizon. Using trigonometry and a marine chronometer, the position of the ship can be determined from such measurements
Trigonometry
which the term 'chronometer' appears. In the work, the claim is made that Thacker created and extensively tested a marine chronometer positioned on gimbals
Jeremy_Thacker
18th-century Royal Navy vessel
Massachusetts. Adams gave to Folger the Bounty's azimuth compass and marine chronometer. Seventeen years later, in 1825, HMS Blossom, on a voyage of exploration
HMS_Bounty
Private home in Los Angeles California
the Reagans by Denis and Margaret Thatcher in 1985 and 1990, and a marine chronometer made by Tiffany & Co. given by Barbara and Frank Sinatra in 1981.
668_St._Cloud_Road
English polymath (1635–1703)
among clock makers. Hooke announced he conceived a way to build a marine chronometer to determine longitude. and with the help of Boyle and others, he
Robert_Hooke
Alias for the UTC+00:00 time zone
time Greenwich Time Signal – Series of six pips broadcast by the BBC Marine chronometer – Clock used on ships to aid in navigation Radio clock – Clock which
Greenwich_Mean_Time
Royal Navy officer and colonial administrator (1754–1817)
water for perhaps a week, a quadrant and a compass, but no charts, or marine chronometer. The gunner, William Peckover, brought his pocket watch, which was
William_Bligh
Town in Cheshire, England
Solihull North since 2004 John Harrison (1693–1776), inventor of the marine chronometer which established longitude; long-time inhabitant of Warrington Anna
Warrington
Coordination of events to operate a system in unison
west their vessel traveled. The invention of an accurate marine chronometer revolutionized marine navigation. By the end of the 19th century, important ports
Synchronization
Artisan who makes and repairs watches
Gérald Genta Chronometer watch Clockmaker Complication Federation of the Swiss Watch Industry FH History of timekeeping devices Marine chronometer National
Watchmaker
1789 mutiny aboard the British Royal Navy ship HMS Bounty
by-then thriving community. Adams gave Bounty's azimuth compass and marine chronometer to Topaz's captain, Mayhew Folger. News of the discovery did not reach
Mutiny_on_the_Bounty
Cylindrical conformal map projection
in navigation. Only in the middle of the 18th century, after the marine chronometer was invented and the spatial distribution of magnetic declination
Mercator_projection
French astronomer
on "marine ether" and on the "inflammation of radical vinegar". In 1767, the Academy of Sciences offered a prize for building a marine chronometer. Le
François César Le Tellier, Marquis of Courtanvaux
François_César_Le_Tellier,_Marquis_of_Courtanvaux
Major UK government spending cuts in the 1920s
efficiency or increased simplicity. For instance, Rupert Gould in The Marine Chronometer (1923) wrote, The necessity for its maker, if he wishes to remain
Geddes_Axe
Mechanical model of the Solar System
eclipses. To put this in chronological context, in 1762 John Harrison's marine chronometer first enabled accurate measurement of longitude. In 1766, astronomer
Orrery
Science of the measurement of time
clockwork, sundials, hourglasses, clepsydras, timers, time recorders, marine chronometers, and atomic clocks are all examples of instruments used to measure
Chronometry
Calendar year
formed by escaped slaves signs a treaty with the local governor. Marine chronometer invented as a means to accurately determine longitude. Matthew Boulton's
1761
Arc crossing all meridians of longitude at the same angle
heading. Early navigators in the time before the invention of the marine chronometer used rhumb line courses on long ocean passages, because the ship's
Rhumb_line
British explorer and naval officer (1728–1779)
Retrieved 30 July 2025. Betts, Jonathan (2018). Marine Chronometers at Greenwich: A Catalogue of Marine Chronometers at the National Maritime Museum, Greenwich
James_Cook
Mainspring force equalizing pulley in timepieces
Harrison added the maintaining power spring to the fusee to keep marine chronometers running during winding, and this was generally adopted. The mainspring
Fusee_(horology)
People that became famous after their death
Science English self-taught clockmaker and carpenter who invented the marine chronometer and was rewarded for it under the Longitude Act. During his lifetime
List of people who achieved posthumous recognition
List_of_people_who_achieved_posthumous_recognition
Room or platform from which a ship can be commanded
Positioning System receiver and chart display, fathometer, a compass, a marine chronometer, two-way radios, and radiotelephone, etc. A flying bridge, also known
Bridge_(nautical)
three years later. Carteret, who sailed without the newly invented marine chronometer, charted the island at 25°02′S 133°21′W / 25.033°S 133.350°W /
History of the Pitcairn Islands
History_of_the_Pitcairn_Islands
Non-existent island near New Caledonia
later charts and maps that were drafted after the development of the marine chronometer and accurate longitude reckoning. Hydrographic charts later placed
Sandy_Island,_New_Caledonia
Tools used by navigators and pilots
Magnetic compass used to determine the magnetic heading of the ship. Marine chronometer used to determine time at the prime meridian with great precision
Navigational_instrument
Italian physicist and astronomer (1564–1642)
problem eventually required the development of a practical portable marine chronometer, such as that of John Harrison. Late in his life, when totally blind
Galileo_Galilei
Continuous progression from past to future
certain precision standards is called a chronometer. Initially, the term was used to refer to the marine chronometer, a timepiece used to determine longitude
Time
Line dividing one calendar day from the next
United States adopted its recommendation for U.S. military and merchant marine ships in 1920. This date line is implied but not explicitly drawn on time
International_Date_Line
drainage is credited to Sir Hugh Dalrymple who died in 1753. 1761 The marine chronometer is invented by John Harrison; enabling accurate nautical navigation
List of British innovations and discoveries
List_of_British_innovations_and_discoveries
List of postage stamps issued by the United Kingdom
February 300th Birth Anniversary of John Harrison (inventor of the marine chronometer). Details of the "H4" clock, 16 February 14th World Orchid Conference
List of British postage stamps
List_of_British_postage_stamps
British class of diesel railcars
153314 Delia Smith 153316 John "Longitude" Harrison inventor of the Marine Chronometer (scrapped) 153322 Benjamin Britten (denamed) 153326 Ted Ellis 153329
British_Rail_Class_153
purposes. She performed the first measurement of longitude using Marine chronometer. During the 18th century, measure of longitude was performed by comparing
French_corvette_Aurore
longitude by means of celestial navigation. The invention of the marine chronometer in the 18th century was a major technical achievement for maritime
Glossary of nautical terms (A–L)
Glossary_of_nautical_terms_(A–L)
Reference frame for measuring location
precision. This led to technological innovations such as the 1735 Marine chronometer by John Harrison, but also to a reconsideration of the underlying
Geodetic_datum
Phantom island in the North Atlantic
navigation was more difficult in this time (before more accurate marine chronometers), and it might have originated from a misidentification of Iceland
Frisland
Dutch mathematician and physicist (1629–1695)
incentive for inventing the pendulum clock was to create an accurate marine chronometer that could be used to find longitude by celestial navigation during
Christiaan_Huygens
Merchant ships operating under charter or license to European East India companies
error that was caused by inaccurate dead reckoning and the lack of a marine chronometer with which to calculate her longitude. With the progressive restriction
East_Indiaman
Publication on celestial body positions
of a celestial body above the horizon, and notes the time from a marine chronometer. That height is compared with the height predicted for a trial position;
Nautical_almanac
American businessman, manufacturer
us." Negus Taffrail log 56-hour Marine chronometer T.S. & J.D. Negus trade card Biography portal Marine chronometer Navigational instrument List of Northeastern
Thomas S. Negus (manufacturer)
Thomas_S._Negus_(manufacturer)
routes, making sea navigation more accurate and efficient. In 1761, marine chronometer was invented. Transport portal History portal History of public transport
History_of_transport
2000 British docudrama miniseries
Longitude presents the story of Harrison's efforts to develop the marine chronometer and thereby win the Longitude prize in the 18th century. This is interwoven
Longitude_(TV_series)
Artisan who makes and repairs clocks
Worshipful Company of Clockmakers Chronometer watch Clockkeeper Horology List of clock manufacturers Marine chronometer National Association of Watch and
Clockmaker
Line of longitude, at which longitude is defined to be 0°
determination of longitude at sea, leading to the development of the marine chronometer by John Harrison. The development of accurate star charts, principally
Prime_meridian
Topics referred to by the same term
DSC-H1, a Sony Cybershot digital camera H1, John Harrison's first marine chronometer Tianwen-1 (formerly Huoxing-1), first Chinese space probe to reach
H1
MARINE CHRONOMETER
MARINE CHRONOMETER
Female
English
Variant spelling of English Marissa, MARISE means "of the sea."Â
Female
English
Variant spelling of English Careen, CARINE means "beloved" or "friend."Â
Female
English
French form of Latin Maria, MARIE means "obstinacy, rebelliousness" or "their rebellion."
Female
English
Feminine form of English Max, MAXINE means either "the greatest rival" or "the stream of Mack."Â
Female
French
French feminine form of Latin Martinus, MARTINE means "of/like Mars."Â
Female
English
Feminine form of Roman Latin Marinus, MARINA means "of the sea."
Female
French
French form of Latin Ariadne, ARIANE means "utterly pure."
Girl/Female
Latin
Of the sea.
Female
French
Feminine form of French Marin, MARINE means "of the sea."
Surname or Lastname
English
English : occupational name for a sailor, Anglo-Norman French mariner (Old French marinier, marnier, merinier). Compare Marin 2.Catalan : occupational name for a sailor, Catalan mariner (Latin marinarius).
Male
French
French form of Roman Latin Marinus, MARIN means "of the sea."
Female
English
Variant spelling of English Marni, MARNIE means "of the sea."
Female
French
Variant spelling of French Corinne, CORINE means "maiden."
Boy/Male
French, Hindu, Indian
Underwater
Female
English
 19th-century English elaborated form of Latin cara, CARINA means "beloved." From the constellation Carina, from Latin carina, which originally meant "shell of a nut," later "keel of a ship."
Female
Greek
(ΜυÏίνη) Variant spelling of Greek Myrina, possibly MYRINE means "swiftly bounding."
Boy/Male
Hindu
Manu the great
Male
Italian
Italian form of Roman Latin Marinus, MARINO means "of the sea."
Female
Scandinavian
Variant spelling of Scandinavian Katrine, CATRINE means "pure."
Female
English
Variant spelling of English Maureen, MAURINE means "obstinacy, rebelliousness" or "their rebellion."
MARINE CHRONOMETER
MARINE CHRONOMETER
Girl/Female
Hindu
Fortunate
Surname or Lastname
English (Shropshire)
English (Shropshire) : unexplained. Origin unidentified.
Boy/Male
Arabic, Muslim
Light of the Faith
Boy/Male
Indian, Sanskrit
Abode of Consciouness; A Temple; A Stupa
Girl/Female
Danish, German, Norse, Norwegian
Thor's Maiden
Surname or Lastname
English
English : habitational name from a lost place in Sussex named Dudehay ‘Dudda’s enclosure (Old English hæg).Irish : reduced Anglicized form of Gaelic Ó Dubhda (see Dowd).
Girl/Female
Hindu
Dawn
Boy/Male
American, British, English
From the Stony Field
Girl/Female
Teutonic American Swedish Norse Scandinavian
Hero's daughter.
Girl/Female
Muslim/Islamic
Poetress
MARINE CHRONOMETER
MARINE CHRONOMETER
MARINE CHRONOMETER
MARINE CHRONOMETER
MARINE CHRONOMETER
v. t.
To furnish with a margin.
a.
Bold; fearless; adventurous; as, daring spirits.
v. t.
To wind marline around; as, to marline a rope.
n.
Boldness; fearlessness; adventurousness; also, a daring act.
a.
Formed by the action of the currents or waves of the sea; as, marine deposits.
a.
Cold; hard; unfeeling; as, a marble breast or heart.
a.
A picture representing some marine subject.
a.
Made of, or resembling, marble; as, a marble mantel; marble paper.
imp. & p. p.
of Margin
a.
Having a margin.
v. t.
To enter in the margin of a page.
n.
The act of one who makes; workmanship; fabrication; construction; as, this is cloth of your own making; the making of peace or war was in his power.
a.
Wild; untamed; savage; as, lions, tigers, wolves, and bears are ferine beasts.
n.
To stain or vein like marble; to variegate in color; as, to marble the edges of a book, or the surface of paper.
a.
Of or pertaining to a goat; as, caprine gambols.
a.
The sum of naval affairs; naval economy; the department of navigation and sea forces; the collective shipping of a country; as, the mercantile marine.
n.
A canine tooth.
a.
Of or caused by acari or mites; as, acarine diseases.
n.
A border; edge; brink; verge; as, the margin of a river or lake.
a.
Of or pertaining to the sea; having to do with the ocean, or with navigation or naval affairs; nautical; as, marine productions or bodies; marine shells; a marine engine.