William Harrison (20 May 1728 – 24 April 1815) was an English instrument maker, the son of John Harrison, inventor of the marine chronometer.
Longitude by chronometer is a method, in navigation, of determining longitude using a marine chronometer, which was developed by John Harrison during the first half of the eighteenth century.
 It is an astronomical method of calculating the longitude at which a position line, drawn from a sight by sextant of any celestial body, crosses the observer's assumed latitude.
 In order to calculate the position line, the time of the sight must be known so that the celestial position i.e. the Greenwich Hour Angle (Celestial Longitude - measured in a westerly direction from Greenwich) and Declination (Celestial Latitude - measured north or south of the equational or celestial equator), of the observed celestial body is known.
 All that can be derived from a single sight is a single position line, which can be achieved at any time during daylight, when both the sea horizon and the sun are visible.
 To achieve a fix, more than one celestial body and the sea horizon must be visible.
 This is usually only possible at dawn and dusk.
Omega SA ( ; ) is a Swiss luxury watchmaker based in Biel/Bienne, Switzerland.
 Britain's Royal Flying Corps chose Omega watches in 1917 as its official timekeepers for its combat units, as did the American army in 1918.
 Omega watches were the choice of NASA and the first watch on the Moon in 1969.
 Omega has been the official timekeeping device of the Olympic Games since 1932.
 James Bond has worn it in films since 1995; other famous Omega wearers, past and present, include John F. Kennedy, Prince William, George Clooney and Buzz Aldrin.
 Omega is owned by the Swatch Group.
Earnshaw Glacier ( ) is a glacier 10 nmi long, flowing northward to the east of Norwood Scarp and entering Maitland Glacier to the south of Werner Peak, in the eastern Antarctic Peninsula.
 It was photographed from the air by the United States Antarctic Service on September 28, 1940.
 It was surveyed by the Falkland Islands Dependencies Survey in January 1961, and was named by the UK Antarctic Place-Names Committee after Thomas Earnshaw, an English watchmaker who made innovations leading to the modern marine chronometer.
In celestial navigation, lunar distance is the angle between the Moon and another celestial body.
 The lunar distances method uses this angle, also called a lunar, and a nautical almanac to calculate Greenwich time.
 By comparing that calculated time to the measured local time, the navigator can determine longitude.
 The method was published in 1763 and used until about 1850 when it was superseded by the marine chronometer.
 It saw limited usage all the way up to the beginning of the 20th century on smaller vessels that could not afford a chronometer or had to rely on this technique for correction of the chronometer.
 A similar method uses the positions of the Galilean moons of Jupiter.
Britglyph was a collaborative locative art and geoglyph project created by Alfie Dennen for ShoZu which took place between December 2008 and March 2009.
 Participants were instructed to travel to specific locations across the United Kingdom with a rock or stone taken from near where they live.
 Once at the designated spot, the participants would capture a photograph or video of themselves and the rock and upload that to the main website, leaving the rock at the location.
 As these media were added to the main site, the image of a watch and chain inspired by John Harrison's marine chronometer H5 was drawn on the main project website, with the rocks creating a geoglyph on the Earth's surface.
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 and developed by John Othenin-Girard and is one of the most accurate non thermo-compensated production watches ever made, keeping time to within 1 second per month
Thomas Earnshaw (4 February 1749 in Ashton-under-Lyne – 1 March 1829 in London) was an English watchmaker who following John Arnold's earlier work, further simplified the process of marine chronometer production, making them available to the general public.
 He is also known for his improvements to the transit clock at the Royal Greenwich Observatory in London and his invention of a chronometer escapement and a form of bimetallic compensation balance.
A marine chronometer is a timepiece that is precise and accurate enough to be used as a portable time standard; it can therefore be used to determine longitude by means of celestial navigation.
 When first developed in the 18th century, it was a major technical achievement, as accurate knowledge of the time over a long sea voyage is necessary for navigation, lacking electronic or communications aids.
 The first true chronometer was the life work of one man, John Harrison, spanning 31 years of persistent experimentation and testing that revolutionized naval (and later aerial) navigation and enabling the Age of Discovery and Colonialism to accelerate.
Jeremy Thacker was an 18th-century writer and watchmaker, who coined the word "chronometer" for precise clocks designed to find longitude at sea.
 He himself created a marine chronometer positioned on gimbals and within a vacuum, but it was a failure.
 The idea of a vacuum for a marine clock had already been proposed by the Italian clockmaker Antonio Tempora in 1668.
 Slightly later, John Harrison would successfully build marine chronometers from 1730.

Question: The Omega Marine Chronometer was made by the watchmaker based in what Swiss city?
Answer: Biel/Bienne