Chapter 789 Nautical positioning

It is said that continental weather changes rapidly, but in fact, tropical ocean storms are more variable.

At the beginning of May, due to the change of the direct sunlight point, which injected energy into the ocean, and with the cooperation of the environment, in the past few days, multiple storm embryos appeared, and finally a situation where two storms danced together, even a strong typhoon. dance.

As a matter of fact, there are many storms in the global tropical oceans in May, but in the end only two wins, one is the storm Eronzuo in the south of the ocean, and the other is the storm Harold in the South Pacific.

Especially on May 1-2, the first strong typhoon E Rongzuo rose to 15, which established the throne of the first strong typhoon in May.

Subsequently, the storm Harold also broke out. At 6 pm in May, when the official broadcast, Harold directly became another 15-level storm, with a maximum wind speed of 48 meters per second.

This is the second strong typhoon of magnitude 15 in the world in May, and it has also attracted attention, even a big focus.

There are two reasons for this. One is that it has great potential. Level 15 is far from its end. Even the Ugly Kingdom predicts that it will reach level 17, and from multiple official forecasts, this guy will still land.

It’s just that after all, it is in the South Pacific, and it can actually affect a few island countries. If they don’t travel there, many people don’t particularly care.

Sure enough, on May 6, the storm Harold changed again, and its intensity increased greatly, setting a new record. The latest official forecast: the maximum wind speed was 120Kt, and the world’s first 16-level super typhoon Harold was generated that year.

Specifically, in the early morning of the 6th, Fiji’s official meteorological bureau data showed that the storm Harold, which had been a strong typhoon of level 15, was upgraded by another level at this time, from a strong tropical cyclone of level 4 to a strong tropical cyclone of level 5. Naturally That is a 16 super typhoon level.

Of course, European and American meteorological agencies, especially the United Typhoon Warning Center of Uganda, also reported the intensity of Harrods’ central minimum pressure of 936 hPa and maximum wind speed of 120Kt, once again confirming the strength of level 16.

Now, everyone has confirmed that Storm Harold’s wind has exploded twice. It is a strong tropical cyclone of level 5, and now the wind has reached level 16, which is a super typhoon level.

As for the second reason, it is the fundamental reason that really made Harold noticed by people all over the world.

An anchor is driving a canoe made by himself, and has been overcoming obstacles in the typhoon sea for fifteen days, and is about to arrive at his destination.

It sounds a lot like a young man who chooses to die in order to gain traffic.

The only difference is that this guy has hundreds of millions of fans, at least five million people watch the live broadcast every day, and just five days ago, with the help of the underwater volcano, he played a wave of century surfing and boarded the “SUEFER”. “Cover.

Even on TV, a variety show that he participated in a month ago is being replayed repeatedly. The reason is that the ratings are too high, so it keeps rebroadcasting.

It is said that in the near future, the animation with its image and actual production will be launched, and there will be a wave of animation films prepared at the end of the year, which is really exciting.

Not to mention his past deeds, even just reading a rough introduction of a dozen lines of words can be called a “legend.”

Through this information, people who don’t know it can know that this is not a young man who wants to die for heat, but a master of survival with real skills. He is Dias, Amundsen style, and will be the same for hundreds of years in the future. Someone to talk about.

When there is preparation and strength, it is no longer a simple act of death, but a vigorous adventure and challenge, a game of the brave, and a recast of the past glory of mankind.

On the Viking, a lit torch was treed on the bow of the ship, swaying from side to side by the strong wind.

Sitting on the edge of the boat, Bi Fang looked up at the looming stars in the sky, holding a piece of charcoal in one hand, writing and drawing on the wooden board.

If you look closely, you can see that there are some complicated formulas on the board, which can make people dizzy just by looking at them.

The ancient Polynesians, who lived on small islands in the middle of the Pacific Ocean, had no maps or compasses; they navigated by looking at the ocean and sky, reading the stars and waves.

The stars in the sky guide them at night, while the color of the sky and the sun, the shape of the clouds, and the direction of the swells guide them during the day. The swells tell them there is land ahead, and birds fly out to sea in search of food to represent islands. It’s already late.

They can sail thousands of kilometers, from Hawaii to Tahiti, with amazing intelligence.

Bi Fang is doing the same thing at this time, but his skills are higher, not empiricism, but scientism, the supreme wisdom of human evolution.

At least a few thousand years ago, the Polynesians migrated with absolutely no idea what trigonometric functions were.

If it weren’t for a typhoon, it would have been cloudless and starry, so it would be more convenient to calculate, but because of the typhoon, the visibility at night was a lot worse, but fortunately, a few of the most important stars could still be seen.

“When I was in Northern Europe, I used the sun to calculate the latitude and longitude, but this trick doesn’t work very well on the sea, because our boat is undulating, so the length of the shadow of the stick will change constantly. Fortunately, we are still You can use the stars, which is also a very simple way.”

[Put down the trigonometric functions in your hand, and we can also talk about the meaning of the word simple. 】

[Woooooo, the great mathematician has started again, I am ashamed, I am inexperienced, I will withdraw from the live broadcast room. 】

[Put down the charcoal in your hand!

! 】

“The era of great navigation, how to position it is actually very simple.”

“Zebrowski addresses this issue in Chapter 5 of “The History of the Circle,” “Exploring the Earth.”

Bi Fang completely ignored the wailing of the audience and began to explain directly.

“In 200 BC, the ancient Greek scientist Eratosthenes had begun to measure the circumference of the earth.”

“He used the length of the shadow of the pole on the summer solstice to measure the angle of incidence of sunlight and the distance between Alexandria and Seini at the Tropic of Cancer, and the circumference of the Earth was measured to be 216,000 stads, or slightly less than 40,000 kilometers. ”

“This measurement is very close to the precise value measured today and is an astounding achievement.”

“Furthermore, Eratosthenes defined the concepts of the equator and the tropic of Cancer by measuring the sun’s trajectory at the summer, winter, vernal and autumnal equinoxes ~www.readmtl.com~. These works provided a theoretical basis for nautical positioning.”

“The work of Eratosthenes laid the concept of latitude and longitude.”

“The radius of the sphere is known. If you can know the latitude and longitude of two points, it will be easier to calculate the distance between the two points, and then plan the sailing time or draw a rough nautical chart.”

“As a result, the problem of navigational positioning has been transformed into how to determine the longitude and latitude of one’s own location in the vast sea.”

“And the basis of everything, ultimately requires a reference frame that can remain constant.”

“It is naturally not found in the vast sea, so we can only hope in the starry sky.”

Bi Fang stretched out his finger and pointed to the vast night sky and followed his finger. There was an eternal star emitting extremely dazzling light. Even in the case of a slight dark cloud, everyone could clearly see its existence.

“Polaris.”

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