# What did Harrison’s clock do?

John Harrison was a carpenter by trade who was self-taught in clock making. During the mid-1720s he designed a series of remarkable precision longcase clocks. In order to solve the problem of Longitude, Harrison aimed to devise a portable clock which kept time to within three seconds a day.

John Harrison, a Yorkshire carpenter, submitted a project in 1730, and in 1735 completed a clock based on a pair of counter-oscillating weighted beams connected by springs whose motion was not influenced by gravity or the motion of a ship.

One may also ask, where are Harrison’s clocks? John Harrison’s marine timekeepers are arguably the most important ever made. You can see them on display in our Time galleries, at the Royal Observatory Greenwich.

Considering this, why is John Harrison important?

He invented the marine Chronometer which enabled a ship to accurately know its longitude at sea (position on east-west access) His invention was critical in the development of long-distance seafaring, which was very important in the eighteenth century.

Who invented the ships clock?

John Harrison

Thomas Tompion

### How was longitude calculated?

The Prime Meridian of zero degrees longitude runs along the meridian passing through the Royal Observatory at Greenwich, England. Longitude is measured east and west from the Prime Meridian. To determine “longitude by chronometer,” a navigator requires a chronometer set to the local time at the Prime Meridian.

### Who invented Watch and Clock?

Christiaan Huygens

### How did sailors tell time?

observations. No wonder sailors talk “bell talk” by answering in bells; they do so because they tell time by counting bell claps. Therefore, in the interval after the bells stop ringing and before they ring again, the current time is somewhere between the time when the bells last rang and one-half hour later.

### Why is time important in navigation?

This is really important because if your clock is off by one second that means your longitude will be off by . These satellites contain several very precise and accurate clocks, because time and location are completely and totally inter-related in satellite navigation.

### Who figured out longitude?

Eratosthenes in the 3rd century BC first proposed a system of latitude and longitude for a map of the world. By the 2nd century BC Hipparchus was the first to use such a system to uniquely specify places on Earth.

### What two methods can sailors use to estimate their latitude?

Latitude lines run horizontally across the globe and are used to measure distances north and south of the equator. Sailors used a sextant to determine their latitudinal position. Longitude lines run vertically across the globe and are used to measure distances east and west of Greenwich, England.

John Harrison

### Who is invented time?

Great advances in accurate time-keeping were made by Galileo Galilei and especially Christiaan Huygens with the invention of pendulum driven clocks along with the invention of the minute hand by Jost Burgi.

### How much is the Harrison lesser watch worth?

In the episode Time on our hands, in which the trotters find the missing Harrison watch, also known as the lesser watch – and get 6 million at sotheby’s, it is all based around a fact.

### What did Harrison invent?

Marine chronometer Grasshopper escapement Gridiron pendulum

### Who used the chronometer?

The term chronometer is also used to describe a marine chronometer used for celestial navigation and determination of longitude. The marine chronometer was invented by John Harrison in 1730. This was the first of a series of chronometers that enabled accurate marine navigation.

### Is the Harrison lesser watch real?

The watch H6, known as The Lesser Watch, was made by English inventor John Harrison in the Eighteenth century. Harrison invented the first ever accurate marine timekeeper to tell seafarers where they were on the globe. His invention won him a prize of £20.000, and he went on to make 5 more watches.

### Where was longitude latitude invented?

Hipparchus, a Greek astronomer (190–120 BC), was the first to specify location using latitude and longitude as co-ordinates. He proposed a zero meridian passing through Rhodes.