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Measuring longitude at sea surface remains an unsolved problem.

The British Admiralty decided that it was necessary to respond to this as soon as possible. In 1713, Parliament offered a reward of £20,000 for skilled craftsmen who could solve the problem.

This is because, while the pendulum pin can measure accurately on land, it can't do so on undulating seas. Many ships were disoriented as a result.

John Harrison, an English magician and inventor, accepted the challenge. After 7 years of hard work, he finally made a warp instrument. In 1735, the warp was tested several times at sea and proved to be very accurate. John Harrison won a huge prize for this.

Harrison's warometer and John Hadley's sextant in the eighteen-thirties made it possible to obtain more accurate maps and charts. Since then, people's seafaring ability has also been greatly improved.

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Useless below. No need to look at the main above.

In recent days, some netizens' computers have appeared:

The screen is pitch black after powering on, but the screen.

**Mouse pointer is displayed and can be moved.

Pressing any key on the keyboard has no response, and the mouse is only mobile, and single and double clicks have no effect.

To put it simply, the computer screen is black, and only the mouse is displayed.

There are too many, only you can't see it, there's nothing you don't want to get.

In this way, you can't see what you want to see, I can't get the gold coins I want to try [0971 Club], just swish, it's okay to see it every day, come back and adopt it, and then there are no other requirements, I hope you can be satisfied with my answer!!

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Hello, cesium video.

Red Flying Dance: Red Jade: refers to the color of clothing, generally refers to a variety of colors.

Red decay: The rope that wears the copper wire decays over time. Described as abundant wealth, countless money and food.

Dazzling: dazzling: dazzling. Described as bright and dazzling. It is also used to describe the extremely high achievement of certain works of art and artistic images.

National color and fragrance: The original description of the color and aroma is different from the peony flower of ordinary flowers. Later, he also described the beauty of the woman.

Fucui Liudan: Emerald: Turquoise. Dan: Vermilion. The color of turquoise vermilion is flowing and emerging. Describe the colors as bright and bright.

Strict filial piety of fathers and sons: Fathers strictly discipline their children, and children obey and respect their fathers.

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Attached to the envy of the noisy piece branch bend in the shoot.

Hello, can you say this kind of specific point, so easy to find.

Amazingly, thoughKindergarten PavilionIt's all meat, I don't even think it's obscene, and there's a little bit of literature and art.

The little things. A good cloud friend.

My cloud number is the number of my name.

Know how to make a nest.