Live Wilderness Adventure

Live Adventure in the Wilderness Chapter 789 Navigation Positioning

It is said that the 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, the ocean was injected with energy, coupled with the cooperation of the environment, in the past few days, multiple storm embryos appeared, and finally a situation of two storms dancing together was brewing, and even a strong typhoon coexisted. dance.

As a matter of fact, there are a total of multiple storms in the tropical oceans of the world in May, but in the end only two win out, one is the storm Iron in the South Pacific Ocean, and the other is the South Pacific storm Harold.

Especially on May 12, Eron rose to a strong typhoon of level 15 first, establishing 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 m/s.

This is the second 15-level strong typhoon 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 point, and even Chouguo predicts that it will reach level 17, and from multiple official forecasts, this guy will land.

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

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

Specifically, in the early hours of the 6th, data from Fiji’s official Meteorological Bureau showed that Storm Harold, which had previously been a strong typhoon of level 15, was upgraded to another level at this time, from a strong tropical cyclone of level 4 to a strong tropical cyclone of level 5. That is, the 16-level super typhoon level.

Of course, European and American meteorological agencies, especially the United States Joint Typhoon Warning Center also gave Harold’s central minimum air pressure of 936 hPa and maximum wind speed of 120kt, reaffirming the strength of level 16.

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

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

An anchor is driving a canoe boat that he made himself, braved the typhoon for 15 days, and is about to arrive at his destination.

It sounds like a young man who chooses to die by any means in order to gain traffic.

The only difference is that this guy has hundreds of millions of fans, and the live broadcast is watched by at least five million people every day, and just five days ago, with the help of a submarine volcano, he played a wave of century surfing and boarded the "Sueer" cover.

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

It is said that in the near future, cartoons based on its image and actual production will be launched, and there will be a wave of animated films prepared by the end of the year, which is really exciting.

Not to mention his past deeds, even if he just read a rough introduction of more than ten lines, he can be called a "legend."

Through these news, people who don't know anything can know that this is not a young man who is desperate for enthusiasm, but a master of survival with real skills. Some people talk about characters.

When you are prepared and have the strength, it is no longer a simple death, but a vigorous adventure and challenge, a game for the brave, and it is a recasting of the past glory of mankind.

On the Viking, a lighted torch was planted on the bow of the ship, which was blown left and right by the strong wind.

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

If you look carefully, you can find that there are some complicated formulas on the wooden board, and just looking at it can make people dizzy.

The ancient Polynesians lived on small islands in the middle of the Pacific Ocean without maps or compasses; they navigated by observing the sea 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, which tells them that there is land ahead, and that birds fly to sea in search of food to represent islands. It's too late.

They can sail thousands of kilometers, sailing from Hawaii to Tahiti, and their intelligence is astounding.

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

At least thousands of years ago, when the Polynesians migrated, they had absolutely no idea what trigonometry was.

If it wasn't for the typhoon, it would have been cloudless and full of stars, which would be easier to calculate, but because of the typhoon, the visibility at night was quite poor, but fortunately, we could still see a few of the most important stars.

"When I was in Northern Europe, I used the sun to calculate the latitude and longitude, but this method is not very effective on the sea, because our ship fluctuates, so the length of the shadow of the erected short stick will continue to change. Fortunately, we still have It is also an extremely simple way to use the stars.”

Put down your trigonometric functions, and let's talk about the meaning of the word simple. 】

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! 】

"How to locate the era of great navigation is actually very simple."

"Chapter 5 of Zebrowski's History of the Circle, Exploring the Earth, is dedicated to this question."

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

"In 200 BC, the ancient Greek scientist Eratosthenes began to measure the circumference of the earth."

"Using the length of the pole shadow on the summer solstice to measure the incident angle of sunlight and the distance between Alexandria and Seni on the Tropic of Cancer, he measured the circumference of the earth as 216,000 stades, or slightly less than 40,000 kilometers. "

"This measurement is very close to the exact value measured today, which is an astonishing achievement."

"Additionally, Eratosthenes defined the concepts of the equator and the tropic by measuring the path of the sun at the summer solstice, winter solstice, vernal equinox, and autumnal equinox. These works provided the theoretical basis for nautical orientation."

"The work of Eratosthenes established the concepts 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 navigation chart."

"Thus, the problem of navigation positioning is transformed into how to determine the latitude and longitude of one's own location in the vast sea."

"And the basis of everything ultimately requires a frame of reference that can remain constant."

"Naturally, it cannot be found in the vast sea, so we can only hope in the starry sky."

Bi Fang stretched out his finger to the vast night sky, and looked along his finger. There was an eternal star emitting extremely dazzling light. Even under the condition of slightly dark clouds, everyone could clearly see its existence.

"Polaris."