The aurora made everyone's vision better, and also accelerated the progress of San Sha.
Sled dogs have excellent endurance. If they run wildly, they can run for most of the day without any problems. Due to the load and quantity issues, after two hours, Bifang grabbed Sansi, stopped the sled, and prepared to take a rest.
"In two hours, we ran at least 25 kilometers. This speed is much faster than me walking."
The normal speed of human beings walking on snow is only about three kilometers per hour. In other words, without the help of sled dogs, Bifang would have walked at least a whole day, but all this was blocked by the three people in front of him.
Guy did it in just two hours.
"Of course, this is the energetic speed at the beginning, and then it won't be that fast. The speed may be reduced by half, but it is still much faster than walking alone. Maybe we can reach the coast tonight."
Bi Fang touched the panting dog's balls, took out the dog bowl, poured some water and food into Sansha respectively, and then stood aside, enjoying the wonderful night view, and chatting with the audience.
Half an hour later, Bi Fang moved forward again after taking a break. It was not until the third break that any audience raised questions because they found that Bi Fang's rest time was too regular, that is, running for two hours and resting for half an hour.
If it was normal times, forget it, but how did Bi Fang judge the time?
"Ah, this is actually very simple." Bi Fang pointed to the sky.
Although there is no watch or sun, Bi Fang still has many ways to judge the time, which will not affect his actions because of time, such as looking at the moon in the sky, or directly asking the audience in the live broadcast room.
Ahem, of course, the last one is suspected of cheating. Unless it is an emergency, Bi Fang will usually choose 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 in the city. No one stipulates when you must do and do things. Everything is decided by yourself.
If you want to survive, you only need food, water and fire.
The acquisition of the three is only slightly related to the time when hunting for food, but this relationship is not much. Just avoid the dusk and night time periods when predators are most common.
Bifang had never encountered the polar night phenomenon before. He always worked according to the sunrise and returned at sunset. However, due to dog sledding, he needed to determine regular rest based on time to improve efficiency.
"That's why I have never talked about how to judge the time. In fact, this is also very simple."
"The sun, moon, and stars rise in the east and set in the west, and they move endlessly. The rise and fall of celestial bodies is like a natural clock showing the time. In astronomy, using this natural phenomenon and observing the stars through precision instruments, we can determine
Exact moment."
"But we can also determine the approximate time by looking at the stars in a simple way. Although the precise procedures are different, the basic principle is still the same. Although it is not usually used in the wilderness, it is still useful for night travelers.
"
[Uh, can the stars tell time? 】
[I can understand talking about the sun, even the moon is not impossible, but the stars are a bit exaggerated]
[I always thought that stars can only be used to determine direction. Old Fang, are you confused?]
[Facts have proved that all those who doubted Lao Fang were finally slapped in the face. Just 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 there was no moon in the sky even though it was a bright and sunny day with many stars?
"Of course not. When the 'Arctic Night' comes, we can only see the full or missing moon rotating around the sky all day long for only half a month. The other half of the month is a continuous period of time.
The moon can’t be seen either. Obviously, it’s the half of the moon where the moon can’t be seen, otherwise I wouldn’t use the stars to tell the time.”
【Sorry, I want to learn】
Bi Fang raised one hand and pointed to the sky: "Did you see the Big Dipper above?"
In the first person perspective, the audience easily found the Big Dipper pointed by Bi Fang and responded repeatedly.
"I said before that if we face the north and then extend the two pole stars at the mouth of the Big Dipper by more than five times, we can find the North Star."
"Now we regard Polaris as the center of the clock surface, and the line connecting the pole star and Polaris 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
This is the Big Dipper Clock."
Since the person's eyesight is the same, what Bi Fang is looking at and pointing to are exactly the same, so there is no chance of misunderstanding. With the help of pointing fingers, the audience can easily imagine a big clock.
[Big Dipper Clock, this name is so cool]
"Since the stars rise in the east and set in the west, the hour hand of the Big Dipper clock rotates in the opposite direction to that of an ordinary clock. After 12 o'clock, it points to 11 o'clock, and then points to 10, 9, 8, 7...and so on. Although the star clock
The direction of rotation of the hour hand is different from that of an ordinary clock, but the time can be determined to be almost the same as that of an ordinary clock."
"When observing, just remember the local longitude. Remember, the longitude is expressed in time units. Because the earth rotates 360° once, it takes 24 hours, so you can divide the local longitude by 15 to find it. Remember
The 'hour' number pointed by the hour hand of the Good Star Clock, as well as the month and date of observation, are finally subtracted by a constant, and the required time can be obtained immediately."
"This method can be written down with a simple formula, that is, capital time = 36.4 - longitude - 2 (clock number + m)."
"m is the number of months from January 1 to the observation time. If the result is a negative number, 24 hours must be added. 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 powerful I am, I don’t know how powerful I am]
[I understand, but I don’t understand]
[What I know is that Fang Shen is awesome, but 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 night of June 1 of a certain year, at the Capital Planetarium, when the longitude = 7:45, you see the pointer of the Big Dipper clock at 10, calculate the current
What time is it in the capital?”
As a result, Bi Fang knew how to wait, and only saw a few chats to get the answer, so he didn't care and just used branches on the snow to get out.
"This kind of thing can actually be done by just doing mental arithmetic. Now that we know that June 1st is 5 months away from January 1st, then m is 5. The capital time at this time is..."
A simple formula appeared on the snow, and the audience suddenly realized it.
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 the Big Dipper cannot be seen, but the Cassiopeia constellation, which is almost opposite to it, rises. We can also use it. The line connecting Beta Cassiopeia and Polaris can also be regarded as the 'hour hand'. The division of the clock face and the rotation of the clock
The direction is the same as the hour hand of the Big Dipper clock."
"When calculating, you need to replace the constant 36.4 with 25.5."
"Of course, if you have a 'sidereal indicating disk', you can almost do no calculations. 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 cabin.