Chapter 789 Navigation Positioning
It is said that the weather on the mainland changes quickly, but in fact, tropical ocean storms change even more rapidly.
In early May, due to changes in the sun's direct point, energy was injected into the ocean. Coupled with the cooperation of the environment, multiple storm embryos appeared in the past few days, and eventually a situation of two storms dancing together was brewing, and even strong typhoons were dancing together.
In fact, there are a total of multiple storms appearing in the tropical oceans around the world in May, but in the end only two won, one is the storm Eronzo in the South Pacific, and the other is the storm Harold in the South Pacific.
Especially on May 1-2, Eronzo first strengthened into a strong typhoon of Category 15, thus establishing itself as the first strong typhoon in May.
Subsequently, Storm Harold also erupted. At 6 pm on May, when the official report was made, Harold had directly become another Category 15 storm with a maximum wind speed of 48 meters per second.
This is the second Category 15 typhoon in the world in May, which has attracted attention and even become a major focus.
There are two reasons for this. One is that it has great potential. Level 15 may be far from its end. Even the United States predicts that it will reach level 17, and judging from multiple official forecasts, this guy will still land.
But after all, it is in the South Pacific, and the only countries it can affect are actually a few island countries. If you don’t go there for tourism, many people don’t particularly care.
Sure enough, on May 6, Storm Harold changed again, its intensity increased greatly, setting a new record. The latest official forecast: maximum wind speed 120Kt, the world's first Category 16 super typhoon Harold was formed that year.
Specifically, in the early morning of the 6th, data from the Fiji Meteorological Bureau showed that Storm Harold, which was already a Category 15 strong typhoon, was upgraded to a Category 5 strong tropical cyclone from a Category 4 strong tropical cyclone, which is naturally a Category 16 super typhoon.
Of course, European and American meteorological agencies, especially the United States Joint Typhoon Warning Center JTWC, also gave Harold's intensity report of a central minimum pressure of 936 hPa and a maximum wind speed of 120 Kt, once again confirming its strength of level 16.
Now, everyone is sure that Storm Harold has experienced a second major wind burst. It was once a Category 5 severe tropical cyclone, but now its wind speed has reached Category 16, which is a super typhoon.
As for the second reason, it is the fundamental reason that made Harold noticed by people all over the world.
A host is driving a canoe he made by himself, and after surviving fifteen days of braving the typhoon sea, he is about to reach his destination.
It sounds like a group of young people who would do anything to gain traffic and choose to commit suicide.
The only difference is that this guy has hundreds of millions of fans, his live broadcasts are watched by at least five million people every day, and just five days ago, with the help of an underwater volcano, he did a century of surfing and was featured on the cover of "SUEFER".
Even on TV, a variety show he participated in a month ago is being rebroadcast over and over again because the ratings were too high.
It is said that soon, a cartoon based on its image and actual production will be released online, and there will be a wave of animated films ready at the end of the year, which is really exciting.
Not to mention his past deeds, even if you just read a brief introduction of a dozen lines, you can call him "legendary."
Through this information, even those who don't know much about him can tell that this is not some young man who is seeking death for attention, but a master of survival with real skills, a Dias or Amundsen-type person who will be talked about for hundreds of years to come.
When you are prepared and have the strength, it is no longer just a matter of seeking death, but a spectacular adventure and challenge, a game for the brave, and a re-creation of the glorious past of mankind.
On the Viking, a lit torch was placed on the bow, swaying left and right in the strong wind.
Bifang sat on the edge of the boat, looking up at the stars that were looming in the sky, holding a piece of charcoal in one hand and writing and drawing on the wooden board.
If you look closely, you will find that the wooden board is covered with complicated formulas, which can make people dizzy just by looking at them.
The ancient Polynesians lived on small islands in the central Pacific. They had no maps or compasses; they navigated by observing the sea and sky, reading the stars and the waves.
The stars in the sky guided them at night, while the color of the sky and the sun, the shape of the clouds and the direction of the waves guided them during the day. The waves told them that there was land ahead, and the sight of birds flying over the sea in search of food meant that an island was within reach.
They can sail thousands of kilometers, from the island of Hawaii to the island of Tahiti, and their wisdom is amazing.
Bifang is doing the same thing at this time, but his skills are more advanced. It is not empiricism, but scientism, which is the highest wisdom of human evolution.
At least thousands of years ago, when the Polynesians migrated, they definitely didn't understand what trigonometry was.
If it weren't for the typhoon, the sky here should have been cloudless and starry, making calculations easier. But because of the typhoon, visibility was much worse at night. Fortunately, we can still see the most important stars.
"When I was in Northern Europe, I used the sun to calculate longitude and latitude. However, this method doesn't work very well on the sea because our ship is up and down, and the length of the shadow of the upright short stick will also change. Fortunately, we can also use the stars, which is also a very simple method."
[Put down the trigonometric functions in your hands, and let's talk about the meaning of the word simple. ]
[Wow, the great mathematician has started again. I am ashamed. I am uneducated and unskilled. I will quit the live broadcast room. ]
【Put down the charcoal pencil in your hand!!!】
"How did people locate themselves during the Age of Exploration? It's actually very simple."
"Zebrovsky devoted his book The History of Circles to this question in Chapter 5, Exploring the Earth."
Bifang completely ignored the audience's wailing and started explaining directly.
"In 200 BC, the ancient Greek scientist Eratosthenes had already begun to measure the circumference of the Earth."
"He used the length of the pole's shadow on the summer solstice to measure the angle of incidence of the sun and the distance between Alexandria and Seni, located on the Tropic of Cancer, and calculated the circumference of the Earth to be 216,000 stadia, or just under 40,000 kilometers."
"This measurement is very close to the exact value measured today, which is an astonishing achievement."
"In addition, Eratosthenes defined the concepts of the equator and the Tropic of Cancer by measuring the trajectory of the sun at the summer solstice, winter solstice, spring equinox and autumn equinox. These works provided the theoretical basis for navigation positioning."
"The work of Eratosthenes laid the foundation for the concept of longitude and latitude."
"The radius of the sphere is known. If we also know the longitude and latitude 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."
"Therefore, the problem of navigation positioning is transformed into how to determine one's longitude and latitude in the vast ocean."
"And the basis of everything ultimately requires a reference system that can remain constant."
"We can't find it on the vast ocean, so we can only hope in the starry sky."
Bifang looked up at the vast night sky, and following his sight, he saw an eternal star emitting an extremely dazzling light. Even if there were slightly dark clouds, everyone could clearly see its existence.
“North Star.”
