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2. Chronograph - Wikipedia

   en.wikipedia.org/wiki/Chronograph

   Chronograph. An Omega Speedmaster Professional, which is commonly regarded as one of the most iconic chronographs ever produced. Gallet MultiChron Astronomic (c. 1959)—complex mechanical chronograph with 12-hour recording capabilities, automatic day, date, month, and moon phase display. A chronograph is a specific type of watch that is used ...

3. Tachymeter (watch) - Wikipedia

   en.wikipedia.org/wiki/Tachymeter_(watch)

   Tachymeter scale on a Citizen watch bezel. A tachymeter (pronounced / t æ ˈ k ɪ m ə t ər /) is a scale sometimes inscribed around the rim of an analog watch with a chronograph.It can be used to conveniently compute the frequency in inverse-hours of an event of a known second-defined period, such as speed (distance over hours) based on travel time (distance over speed), or measure distance ...

4. Longitude by chronometer - Wikipedia

   en.wikipedia.org/wiki/Longitude_by_chronometer

   Longitude by 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 ...

5. Chronometer watch - Wikipedia

   en.wikipedia.org/wiki/Chronometer_watch

   Chronometer watch. A chronometer (Ancient Greek: χρονόμετρον, khronómetron, "time measurer") is an extraordinarily accurate mechanical timepiece, with an original focus on the needs of maritime navigation. In Switzerland, timepieces certified by the Contrôle Officiel Suisse des Chronomètres (COSC) may be marked as Certified ...

6. Marine chronometer - Wikipedia

   en.wikipedia.org/wiki/Marine_chronometer

   In typical use, the chronometer would be mounted in a sheltered location below decks to avoid damage and exposure to the elements. Mariners would use the chronometer to set a so-called hack watch, which would be carried on deck to make the astronomical observations. Though much less accurate (and less expensive) than the chronometer, the hack ...

7. Omega Speedmaster - Wikipedia

   en.wikipedia.org/wiki/Omega_Speedmaster

   Omega Speedmaster is a line of chronograph wristwatches produced by Omega SA. While chronographs have existed since the late 1800s, Omega first introduced this line of chronographs in 1957. Since then, many different chronograph movements have been marketed under the Speedmaster name. Astronaut Walter Schirra was the first person to wear one in ...

8. Rolex Cosmograph Daytona - Wikipedia

   en.wikipedia.org/wiki/Rolex_Cosmograph_Daytona

   www.rolex.com /watches /cosmograph-daytona /. The Rolex Cosmograph Daytona is a mechanical chronograph wristwatch designed to meet the needs of racing drivers by measuring elapsed time and calculating average speed. Its name refers to Daytona, Florida, where racing flourished in the early 20th century. It has been manufactured by Rolex since ...

9. Double chronograph - Wikipedia

   en.wikipedia.org/wiki/Double_chronograph

   Double or Rattrapante Chronograph Wristwatch (1948) - manufactured by the Gallet Watch Company in La Chaux-de-Fonds, Switzerland. The Double chronograph, also known as a split-seconds chronograph, is a watch that includes two distinct stopwatch mechanisms in order to measure two separate events concurrently and/or comparatively.