Live Wilderness Adventure - Chapter 696 star clock

Aurora made everyone's vision better, and it also accelerated Sansha's forward speed.

The sled dog's endurance is very good. If he runs happily, he will be fine for most of the day. Due to the load and quantity, Bi Fang stopped Sansha two hours later and stopped the sled to take a rest.

"In two hours, we ran at least 25 kilometers, which is much faster than me."

The normal speed of human walking on snow is only about 3 kilometers per hour. In other words, without the help of sled dogs, Bi Fang would have to walk for at least a whole day, but all this was caught by three people in front of him. The guy did it in just two hours.

"Of course, this is the energetic speed at the beginning, and then it will not be so fast. The speed may be halved, but it is still much faster than walking alone. Maybe we can get to the coast tonight."

Bi Fang touched the panting dog's egg, took out the dog bowl, and poured some water and food for the three fools. Then he did it himself, admired the wonderful night scene, and chatted with the audience.

Half an hour later, after the rest, Bi Fang moved forward again. It was not until the third break that the audience asked questions, because they found that Bi Fang's rest time was too regular, that is, running for two hours, then resting for half an hour.

If it's normal, that's fine, but how did Bi Fang judge the time?

"Ah, this, it's actually very simple." Bi Fang pointed to the sky.

Although there is no watch and no sun, Bi Fang still has many ways to judge the time, which will not affect his actions because of the time, such as watching the moon in the sky, or directly asking the audience in the live broadcast room.

Cough, of course, the last one is suspected of cheating. Unless it is an emergency, Bi Fang usually chooses to judge in his own way.

"In the wilderness, judging time is usually not that important, because many times you don't actually need this thing."

Survival in the wild is no better than a city. No one dictates when you must do what you do. Everything is up to you.

If you want to survive, you only need food, water and fire.

The acquisition of the three is only a little related to time when hunting for food, but this relationship is not very much, as long as it avoids the most frequent time periods of dusk and night predators.

Before the author, Bi Fang had never encountered the phenomenon of polar night, and he always acted according to the sunrise and sunset, but now because of the dog sled, it is necessary to determine the regular rest according to the time to improve the efficiency.

"That's exactly what it is, so I never talked about how to judge the time. In fact, this is also very simple."

"The sun, the moon, and the stars rise and fall in the east and set in the west, running endlessly. The rise and fall of celestial bodies is like a natural clock showing the time. In astronomy, by using this natural phenomenon and observing the stars with precision instruments, it is possible to determine Precise time."

"But we can get an approximate time by looking at the stars in a simple way. Although the exact procedure is different, the basic principle is the same. Although not usually used in the wilderness, it is more useful for night travelers. "

[Er, stars can also tell time? 】

[I can understand the sun, even the moon, but the stars are a bit exaggerated]

[I always thought that the stars can only be used to determine the direction, Lao Fang, are you confused and confused]

[It turns out that all those who doubted Lao Fang were finally slapped in the face, honestly take out your notebook and start studying! 】

Some people expressed doubts about Bi Fang's remarks, the sun and the moon, the former is easy to judge the time, the latter is not impossible, it is just more difficult, but the stars are outrageous!

[By the way, why is there no moon today, isn't it sunny? 】

Speaking of the moon, many viewers suddenly noticed that it was a sunny day with stars, but there was no moon in the sky?

"Of course not, when the 'Arctic Night' comes. There is only half a month in the month when we can see the full or absent moon revolving around the sky all day. The moon can't be seen either. Obviously, now is the half month when the moon is not visible, otherwise I wouldn't use the stars to judge the time."

[Xiaolong, I want to learn]

Bi Fang freed one hand and pointed to the sky: "Have you seen the Big Dipper above?"

In the first person, the audience easily found the Big Dipper that Bi Fang was referring to, and responded again and again.

"As I said before, we face the north, and then extend the two pole stars at the mouth of the Big Dipper by more than five times, and we can find the North Star."

"Now we take the North Star as the center of the clock face, and the line connecting the Pole Star and the North Star as the hour hand. Divide the clock face into twelve equal parts: 12 on the top, 3 on the right, 6 on the bottom, 9 on the left, and 9 on the left. This is the Big Dipper Clock."

Since the people's eyes are the same, what Bi Fang is looking at and what he is referring to are exactly the same, so there is no misunderstanding. With the identification of the hands, the audience can easily imagine a big clock.

[The Big Dipper Clock, the name is so cool]

"Because the stars rise in the east and set in the west, the clock hand of the Big Dipper clock rotates in the opposite direction to that of an ordinary clock. After 12 o'clock, it refers to 11 o'clock, and then to 10, 9, 8, 7... etc. The direction of rotation of the hour hand is different from that of ordinary clocks, but it is completely possible to obtain the time that is almost the same as that of ordinary clocks.”

"When observing, just remember the local longitude. Remember, the longitude should be expressed in units of time. Because the earth rotates 360°, it takes 24 hours, so you can use 15 to divide the local longitude. The 'hour' number pointed to by the hands of the good star clock, as well as the month and date of the observation, are finally subtracted from a constant, and the required time is immediately obtained."

"This method can be written down in a simple formula, that is, capital time = 36.4 - longitude - 2 (hour number + M)."

"M is the number of months from January 1st to the observation time. If the result is a negative number, add 24 hours. As for the source of the number 36.4 hours, it can be simply understood as a constant in the formula, no need to understand. ."

[I don't know how to feel strong, I don't know how to feel severe]

[Understood, but didn't understand]

[What I understand is that Fang Shen is awesome, the difference is how to judge the time (dog head)]

"It's actually very simple." Bi Fang said with a smile, "For example, on the evening of June 1st of a certain year, at the Capital Planetarium, when the longitude = 7:45, you saw that the hand of the Big Dipper clock was at 10, calculate the current What time is the capital time?"

In the end, Bi Fang waited for it. UU reading www.uukanshu.com only saw a few chats and came up with the answer, so he didn't give a shit, and came out directly with a branch on the snow.

"This kind of thing, you can actually do a mental calculation. Now that you know that June 1 is 5 months away from January 1, M is 5. The capital time at this time is..."

A simple formula appeared on the snow, which made the audience suddenly realize.

36.4 hours-7.8 hours-2(10+5) hours=-1.4 hours.

-1.4+24=22.6 hours.

That is 10:36 pm.

"Sometimes you can't see the Big Dipper, but the constellation Cassiopeia, which is almost opposite to it, has risen. We can also use it. The line between Beta Cassiopeia and Polaris can also be used as an 'hour hand'. Clock face division and clock rotation The direction is the same as that of the Big Dipper clock."

"When calculating, you need to replace the constant 36.4 with 25.5."

"Of course, if you have a 'star indicator disk', you can hardly calculate the time. Just pull the astrolabe and you will know the time immediately. This is more complicated. If you have time, you can make one when you return to the wooden house. ."

"How about it, simple, right?"

Bi Fang clapped his hands and said cheerfully.

Please remember the first domain name of this book: . The fastest update website of Apex Novel Network mobile version: