Live Wilderness Adventure

Chapter 699 Star Clock

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

The sled dogs have excellent stamina. If they run happily, they can run for half a day. Due to the load and quantity, after two hours, Bi Fang stopped Sansha, stopped the sled, and prepared to take a rest.

In two hours, we ran at least twenty-five kilometers, which is much faster than I can walk.

The normal human walking speed on the snow is only about three kilometers per hour. In other words, without the help of sled dogs, Bi Fang would have to walk for at least a whole day. Guy did it in just two hours.

Of course, this is the speed at which I was full of energy 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 reach the coast tonight.

Bi Fang touched the panting dog egg, took out the dog bowl, poured some drinking water and food for Sansha respectively, and then stood aside himself, enjoying the wonderful night view and chatting 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 raised questions, because they found that Bi Fang's rest time was too regular, that is, to run for two hours and rest for half an hour.

It's fine if it's normal, 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 and no sun, Bi Fang still has many ways to judge the time, and the action will not be affected by the time, such as looking at the moon in the sky, or directly asking the audience in the live broadcast room.

Cough cough, of course, the last one is suspected of cheating, unless it is an emergency, usually Bi Fang still chooses to use his own way to judge.

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 stipulates when you must do what, 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 bit related to time when hunting for food, but this relationship is not very much, as long as you avoid the time periods when predators are most frequent at dusk and night.

Before that, Bi Fang had never encountered the phenomenon of polar night. He always worked according to the sunrise and returned to the sunset, but now because of the dog sledding, it is necessary to determine the regular rest according to the time to improve efficiency.

That's exactly the case, so I haven't talked about how to judge the time. In fact, this is also very simple.

The sun, the moon, and the stars rise in the east and set in the west, and they move continuously. 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 usually not used in the wilderness, it is still more useful for night travelers.

[Uh, the stars can also tell the time? 】

[I can understand the sun, even the moon is not bad, but the stars are a bit exaggerated]

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

[Facts have proved that all those who doubted Lao Fang were slapped in the face in the end, honestly take out your notebook and start studying! 】

Some people expressed doubts about Bi Fang's statement, the sun and the moon, the former is easy to judge the time, the latter is not impossible, but it is 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 full of stars, but there was no moon in the sky?

Of course not, when the 'Arctic Night' comes. Only half a month in a month can we see the full or missing moon revolving around the sky all day long. The moon is also invisible, obviously, now is the half month when the moon cannot be seen, otherwise I would not use the stars to judge the time.

【Worry, I want to learn】

Bi Fang pointed a finger at the sky: Did you see the Big Dipper above?

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

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

Now we regard the Polaris as the center of the clock face, and the line connecting the Pole Star and the Polaris as the hour hand. Divide the clock face into twelve equal divisions: 12 above, 3 on the right, 6 below, 9 on the left, and This is the Big Dipper Clock.

Because people claim to have the same line of sight, what Bi Fang sees and points to is exactly the same, so there is no misreading. With the identification of hands, the audience can easily imagine a big clock.

[Big Dipper Clock, the name is so cool]

Because the stars rise in the east and set in the west, the direction of the hour hand of the Big Dipper clock is opposite to that of ordinary clocks. After 12 o'clock, it refers to 11 o'clock, and then refers to 10, 9, 8, 7...etc., although the star clock 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, here the longitude is expressed in units of time. Because the earth rotates 360°, it takes 24 hours, so you can divide the local longitude by 15 to get it. The 'hour' number pointed by the hour hand of a good star clock, as well as the month and date of observation, and finally subtracted by a constant, can immediately obtain the required time.

This method can be written down with 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 negative, 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 it, I don't know how to feel it]

【Understand, but don't understand】

[What I understand 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, longitude = 7:45, you saw the hand of the Big Dipper clock at 10, calculate the current What time is the capital time?

As a result, Bi Fang could do it after waiting, and only saw that he got the answer after a few chats, so he didn't hold back, and just came out on the snow with a branch.

For this kind of thing, you can actually do a mental calculation. Now that June 1 is 5 months away from January 1, then 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's 10:36 p.m.

Sometimes the Big Dipper cannot be seen, but the constellation Cassiopeia, which is almost opposite to it, rises, and we can also use it, right? The line connecting Beta Cassiopeia and Polaris can also be used 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 'star dial', 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 wooden house. .”

How about it, is it simple?

Bi Fang clapped his hands and said cheerfully.