Live Wilderness Adventure

Chapter 794 Arriving at Point Nemo

The galaxy is so bright that even the howling wind cannot cover up the brilliance of the stars, shining in the dark night, guiding all the lost travelers.

Following the direction of Bi Fang's finger, everyone was fascinated.

Someone once took a time-lapse exposure photo in the starry sky of the northern hemisphere, and the stars moved. Because of the rotation of the earth, the trajectories of stars in the sky formed concentric circles one after another.

Only the star in the center of the circle remains constant in the field of view, because it is located on the extension line of the earth's axis.

This star is called Polaris, and it is also everyone's old friend.

For observers in the northern hemisphere, Polaris is always stationary, and other stars revolve around Polaris.

etc.

Northern Hemisphere Observer?

Some viewers smacked their mouths, wondering what seemed wrong.

After a long while, someone realized in a daze, isn't Fang Shen in the southern hemisphere?

[Can the Polaris be seen in the southern hemisphere? 】

【I slowly make a question mark】

[Fuck, I just turned the corner. Isn’t Lao Fang in Teba’s southern hemisphere? How could he see Polaris? 】

"When did I say that this is the North Star?" Bi Fang laughed twice, "I never said that this is the North Star."

"I just use Polaris as an example, because the underlying logic is the same, and Polaris is familiar to everyone, so I think everyone may understand it better."

【I am silly】

【feint shot】

【biubiubiu】

[Sorry, I don't understand what star you take. 】

[So what star is this? 】

[The southern hemisphere is the Antarctic star? 】

"There is no such thing as the South Pole Star, which is actually the center point of the Southern Cross constellation,"

"Polaris is located on the extension line of the earth's axis, and the distance from the earth is very, very far, so far that the radius of the earth can be ignored compared with it."

"So, looking at the direction of Polaris from a certain position on the surface of the earth, this line of sight is parallel to the earth's axis. Then, the angle between this line of sight and the horizon, which is the elevation angle of Polaris in the field of view, is equal to the latitude of that point."

"That is to say, if you look for Polaris in your field of vision and find that it is directly above your head, that is, the elevation angle is 90 degrees, it means that your latitude is 90 degrees, and you are stepping on the North Pole."

"If you look for Polaris in your field of vision and find that it is on the horizon and the elevation angle is 0, it means that your latitude is 0 degrees, and you are sailing on the equator. If the elevation angle is 30 degrees, it means that your current position is 30 degrees north latitude. "

[I talked about this last time, I remember you can use a sextant]

【Fangshen's sextant is ready】

[That was the sextant just now, right? 】

The audience remembered the strange thing made up of a few thin wooden sticks that Bi Fang took out before he started to calculate, and immediately understood its purpose.

Bi Fang did not deny it.

It is a stroke of luck that these simple gadgets have not been lost in previous adventures.

"This is the process of determining the northern latitude, and although the southern latitude does not have a corresponding South Pole star, we found that the central point of the Southern Cross constellation can approximately play the role of the South Pole star."

"Although such observations are not accurate enough, they are sufficient for navigational positioning."

Bi Fang pointed to the starlight in the night sky. After careful observation, everyone found that this star was indeed quite different from Polaris. Although it was also very bright, there was a lot of brightness around it.

Thanks to the Polaris and the Southern Cross constellations, with the help of suitable measuring instruments, experienced navigators can easily determine their latitude, but measuring longitude is much more difficult.

"Latitude is a series of parallel lines, while longitude is a series of lines that meet at the poles."

"The earth rotates in the east-west direction, there is no east pole or west pole, so there is no east pole star or west pole star."

"However, the navigators still discovered a rule, which has nothing to do with the starry sky, but has something to do with time."

"We clearly know the concept of time zone. For example, it is 2:00 am China time, which is 1:00 noon Eastern time. If I know that the current China time is 2:00 am, and the current local time is 1:00 am, So, can I deduce that the time zone I am in is the Eastern time zone?"

"Then, I can know that my longitude is the longitude of the eastern part of Ugly Country. Therefore, the problem of measuring longitude is transformed into the problem of measuring the time of the known location and the time of the current location."

【I can't do it, my head hurts】

【Master Fang, stop reading, stop reading】

【Dream back to high school geography class】

【Learning is useless, learning is useless】

Bi Fang followed up with a series of analysis, with charcoal pencils non-stop, both as if explaining, and as if sorting out his own thoughts.

"The earth's rotation period is 24 hours, that is, it rotates 360 degrees in 24 hours, rotates 15 degrees per hour, and rotates 1 degree every 4 minutes."

"If the port of departure is used as the reference point, such as starting from London, Greenwich Mean Time is used as the standard time, and the meridian where Greenwich is located is used as the 0-degree meridian."

"Later, at a certain position during the voyage, Greenwich Mean Time is 1 am, local time is 9 am, a difference of 8 hours, that is, the difference between this position and Greenwich Mean is 8 times 15 equals 120 degrees , that is, the current position is 120 degrees east longitude."

"It's just that there is a crucial question here. How to determine Greenwich Mean Time and local time in the vast sea?"

【corona bar】

[clock? 】

"It's a sundial."

The crew will set up a sundial on the deck and use the direction of the sun's shadow to determine the time.

The ups and downs of the ship have a greater impact on the length of the shadow, but have little effect on the change in the direction of the tilt.

Greenwich Mean Time is determined by clocks. Set your clocks to Greenwich Mean Time when you set off in London, and never set them again.

【Sounds like it's a little simpler than Lao Fang's calculation last time? 】

[I don’t know, I don’t know any of them anyway, just listen to it and it’s over]

[I picked up a pen in class, and I never understood Fang Shen's problem-solving ideas again]

Bi Fang shook his head again.

"It's easy to say, but it's more difficult to actually implement it. Because this method relies heavily on an accurate and reliable clock, otherwise, the effect will be greatly reduced. Although the ancient Greeks invented the theory of longitude, but because of constraints The craftsmanship of clocks and watches, until the 18th century, navigators could accurately measure their own longitude."

"Before this, there was even a law in maritime navigation. If a soldier casually told the captain about the route, he would be executed immediately.

Because they could not determine their route at that time, they relied entirely on the experience and intuition of the captain. They only knew their latitude but not their longitude, until later reliable clocks were invented. "

【Hiss, it all depends on Meng, right?】

[Actually, sailing does not necessarily require precise knowledge of one’s own latitude and longitude. Lao Fang has special needs. People at that time, as long as the direction is right, they can keep their heads down. There are also surfaces along the way, such as islands or something]

[Indeed, Nemo doesn’t have anything on the surface, this is the most annoying thing]

"For this reason, the lunar distance method was generally used for a period of time, and the universal time was calculated by measuring the angular distance between the moon and the stars. In addition, there are Davis quadrants, starboards and sextants, all of which are The way to solve your own position at that time.”

"It's also why many famous watches today have the origin of nautical models. Due to the inconvenience of longitude measurement, navigators came up with an approximate measurement method, which is to look at the distance, which is the so-called nautical mile."

"Many people may wonder why the distance of sailing is not used in kilometers or miles. This common unit is used in nautical miles. It seems that it is specially used to embarrass others. The speed of sailing must also be used in knots. In fact, this is for the convenience of determining the position. Because The arc length of 1 nautical mile corresponds to 1 minute of the central angle of the earth."

[Hiss, is that so? 】

[I used to do similar math problems and felt that things in the sea are anti-human. Why do you need to create a distance and speed unit for sailing? Is this the reason?]

[Increased knowledge. 】

"Every nautical mile sailing in the north-south direction means that the latitude changes by 1 minute; every nautical mile sailing in the east-west direction on the equator means that the longitude changes by 1 minute; if you sail east-west on the non-equator, you need to multiply the reciprocal of the latitude cos as a correction coefficient."

The "knot" of the speed unit also comes from this, and 1 knot is equal to 1 nautical mile per hour. "

"So, we just need to know how far we've sailed."

Bi Fang explained carefully without stopping the movement of his hand, rubbing the black charcoal pencil on the wooden board, leaving black charcoal ash.

The torches at the bow swayed in the wind, and the figures flickered.

Of course, the distance calculation cannot be accurate. In fact, the positioning accuracy of the age of sails can be tens to hundreds of kilometers.

Coupled with the mixed use of several methods, mutual comparison and correction, although it is not as good as GPS, it is enough for Bi Fang to arrive at the destination accurately.

Although Point Nemo is a point, it does not mean that Bi Fang must sail through this point precisely to be considered a successful crossing.

As long as it is near it, this mission can already be regarded as a success.

It doesn't even matter where you go next, whether it's going back, or going straight to the next island.

Through various calculations and steps, the wooden board seems to have solved a big math problem, and even marked with a small serial number.

Each serial number represents that Bi Fang used a calculation method to find out the location.

When the three coordinates appeared, Bi Fang listed them, verified each other, and breathed a sigh of relief.

In front of everyone, he shook the wooden board in his hand, circled a coordinate heavily, then threw down the charcoal pencil, lay down in the Viking, looked up at the night sky, with a very sad tone.

"Finally good luck for the last time."

"Point Nemo, right under our feet."

Point Nemo. Right under your feet! ?

The audience was stunned.

That's it, is it here?

Everyone who thought there was still at least some distance to go never expected that the mission would be completed like this?

Bi Fang put his arms under his head, and felt indescribably relaxed, and the sky and the earth widened in an instant.

And at the moment when the latitude and longitude came out, the task finally changed on the blue fluorescent system panel, and the half-completed status was displayed above the Nemo point.

That is to say, at the moment when the body and mind were completely relaxed, Bi Fang's eyelids suddenly became extremely heavy, and he couldn't open his eyes for a while.

The audience in the live broadcast room undoubtedly fell into cheers again, and the bullet screens emerged rapidly, swiping across the entire screen, and they couldn't see the actual picture for a while, but soon, some audience members heard something in the wind. other voices.

When the heat subsided a little, and finally could see clearly in the picture, countless people were dumbfounded.

Bi Fang fell asleep just like that.

Leaving aside how lively the Internet is, these are all part of Bi Fang's routine operations. When he woke up the next day, Bi Fang felt that his spirit was more energetic than ever, and even the soreness in his muscles seemed to have eased a lot at once. .

Now it is only the seventeenth day since Bi Fang set off from Easter Island, and the speed can be said to be extremely fast.

Bi Fang did not relax his vigilance either. Although the most critical part of the mission had been completed, there was still a typhoon chasing after him, and now was not the time to stop.

During this period, Typhoon Harold landed strongly on Vanuatu as predicted, causing extremely serious disasters.

Although there are several relatively powerful storms in the active summer tropical cyclone season in the South Pacific every year, it is relatively rare for such a strong storm to hit a country with the strongest posture this year. This may represent that the climate model in the Pacific is in a state of depression in an abnormal state.

For the sake of safety, Bi Fang did not choose to go back the same way, as it might be too dangerous to get close to the typhoon, so he chose to move on.

Among the three islands closest to Nemo Point, Disi Island and Easter Island are very close, and Maher Island is too close to the Antarctic.

Going to Antarctica, although away from the typhoon, the temperature will continue to drop, Bi Fang did not bring enough warm clothes.

And the drop in temperature will also expand the food gap.

Therefore, after careful consideration, Bi Fang directly headed for the farther but more convenient South America.

There were not too many accidents during the period, and the danger plummeted due to the distance from the typhoon.

On the 31st day, some fish finally appeared in the sea, alleviating Bi Fang's food crisis at that time, and also proved that Bi Fang was far away from that quiet place.

The time finally came to the thirty-fourth day, and the first island appeared in front of Bi Fang, symbolizing the perfect ending of the crossing.

The canoe was ups and downs, and Bi Fang stood on the bow of the boat, looking into the distance.

The island in the distance is lush and full of life.

The setting sun falls below the sea level, the golden light spreads across the ocean, and the birds return to their nests.

Looking at the island in front of him, Bi Fang no longer paddles, no longer controls the sails, puts away the sails, throws down the oars, and drifts with the current.

The waves collided and crashed, making a unique tide sound, which was the most sound Bi Fang had heard in more than a month.

After 34 days, starting from Easter Island, crossing the entire South Pacific Ocean, crossing the inaccessible pole of the ocean, and finally drifting across the sea, arriving at a small island in South America on the other side.

This is truly unprecedented, the opening remarks are no longer empty words, but everything he has experienced!

Female giant pandas can only be pregnant for 24-72 hours a year. If male giant pandas do not take action at this time, they will have to wait another year. However, pandas generally do not reach sexual maturity until they are seven years old. I have been sterilized, so I only have about 39 days in my life to have the opportunity to enjoy the joy of love.