How do you tell the east and west, north and south with a watch?

There are many ways to find out where you can get lost on Earth, and the compass is a commonly used tool for finding direction. The compass is actually a small magnet, and it is able to work on Earth because the Earth is a large magnet, and the N and S poles of the magnet are very close to the south and north poles geographically. The poles of the same name repel each other, and the poles of the same name attract each other, so the compass can be used as a guide.

Despite the presence of geomagnetic declination, for the vast majority of locations on Earth, a compass is sufficient to discern the direction when the requirements are not very precise.

If humans had landed on Mars, Mars would not have a global magnetic field, and the compass would not have worked on Mars. On Mars, there is no way to judge east, west, north and south with the help of vegetation, and the North Star on Mars is also different from the North Star on Earth. Although astronauts who set foot on the surface of Mars do not have to worry about getting lost on Mars, there is a method that needs to be popularized, because it can be used to distinguish between east and west, north and south, both on Earth and on Mars.

It takes about 24 hours for the Earth to rotate around the Earth, and when you look at the Sun from Earth, the Sun will circle the Earth every 24 hours. If you can make such a watch, so that the hour hand of the watch also rotates once every 24 hours, then the watch can be placed in a reasonable position, and the hour hand on the watch will always point to the position of the sun.

And the hour hand of the watch we actually use rotates once every 12 hours, faster than the sun, it doesn't matter, just divide the scale it refers to by 2. The sun sets at 18 o'clock in the evening, divide 18 o'clock by 2 to get 9 o'clock, and point the 9 o'clock on the watch dial to the sun, at this time you will find that the direction corresponding to the 12 on the dial is north. The sun rises at 6 o'clock in the morning, divide 6 o'clock by 2 to get 3 o'clock, point 3 o'clock on the dial with the sun, and 12 on the dial is still in the north.

Regardless of the moment in time, this method can be used to determine east, west, north and south in most parts of the earth, provided that the time indicated by your watch does not deviate too much.

Mars' rotation period is very close to that of Earth, and it also rotates from west to east like Earth. If the moment on Mars is also defined by the rotation of Mars, then this method of judging east, west, north and south is also applicable on Mars.

Place the watch horizontally to the approximate position of the sun, which is south at the current time and halfway between 12 o'clock.

1.Place the watch dial flat on the ground.

2.Aim the time of the watch at the position of the sun.

3.The position between the hour hand and twelve o'clock is the south.

The hour hand inside the watch actually has the effect of a compass, which can work in the case of a broken watch.

1. The method of judging the direction of the watch: The method is very simple, divide the current time of your watch by 2, and then find the corresponding position of the quotient on the dial, and then point this number at the sun, and the direction pointed by the "12" point on the dial is north.

For example, at 10 a.m., divide by 2, and the quotient is equal to 5Align the "5" on the dial with the sun, and the "12" will be north. Once the north is determined, the other directions are clear at a glance.

Keep in mind, however, that if it's in the afternoon, it should be calculated according to the 24-hour chronology. For example, at 2 p.m., it will be counted as 14 o'clock. Finding directions in this way is comparable to what a compass would like.

Second, the watch's mantra for judging the direction: "the hours are folded half to the sun, 12 refers to the north", generally between 9 a.m. and 4 p.m., you can quickly identify the direction, with half of the time pointing to the sun, 12 hours is the north, such as the time of 15:00 in the afternoon, half of which is 7:

30, the hour hand 7 o'clock to the sun, then 12 refers to the north, or the watch is flat, the hour hand points to the sun, the reverse extension of the hour hand and the 12 scale bisector is the north; Or put a watch, stand a small stick vertically on the watch** and turn the watch, so that the shadow of the small stick coincides with the hour hand, and the bisector between the hour and the 12 hours is the north.

3. Matters necessary to judge the direction with the watch:

1) When determining the direction, the watch should be flat;

2) It should not be used around noon in the area between 20°30 north latitude and south latitude, that is, the meridian of the standard time shall prevail, add 1 hour to every 15 ° to the east, and subtract 1 hour to the west 15 °.

Fourth, the principle of judging the direction with a watch.

The earth rotates 360 degrees in 24 hours and 15 degrees in an hour, and the hour hand of a watch always rotates twice as fast as the sun. At 6 o'clock in the morning, the sun is in the east, and the shadow points to the west, at this time, the hour hand on the watch points to the sun, and the "12" on the dial points to the west, if the dial rotates 90 degrees, it is half folded at 6 o'clock, so that the "3" on the dial is facing the sun, and the "12" is pointing to the north; At 12 noon, the sun is in the south, and the 12 is split in half, so that the "6" on the dial is facing the sun, and the "12" still refers to the north.

Watches (1) Watches with hands are used to hold the watch flat, the dial up, turn the watch, and point the hour hand on the watch box to the sun. At this time, the hour hand of the watch forms an angle with the 12 o'clock on the dial, and the extension of the bisector of this angle is south. (2) The method is very simple, divide the time you are in by 2, and then find the corresponding position of the quotient on the dial, and then point this number at the sun, and the direction of "12 o'clock on the dial is north."

For example, at 10 a.m., divide by 2 and the quotient is 5. Align the "5" on the dial with the sun, and the "12" will be north. Once the north is determined, the other directions are clear at a glance.

Keep in mind, however, that if it's in the afternoon, it should be calculated according to the 24-hour chronology. If it is 4 p.m., it will be counted as 16 o'clock. Finding directions in this way is no less accurate than a compass.

After finding the south, with your back to the south, you are facing the north, the left hand is west, and the right hand is east.

Remember to adopt it.

The clock refers to the north at 12 o'clock, and the so-called morning sun just rises when it faces the sun, the front is east, the back is west, the left is north, and the right is south.

1) Read the local time in 24-hour format.

2) Divide the number of hours read out by 2 to find the corresponding number on the watch.

3) The direction of the number is aligned with the Sun.

4) At this point, 6 o'clock points to the south and 12 o'clock points to the north.

Unless you have a compass in your watch, you can't.

First of all, the Earth rotates once in 24 hours, which also causes our day and night to change. The watch turns a full two times in 24 hours, so dividing the time in the 24-hour clock by two is to synchronize the rotation speed with the scale on the dial. Assuming the sun rises at 6 a.m., then the direction of 3 o'clock is aimed at the sun rising in the east, and the direction indicated at 12 o'clock is due north.

At 6 p.m. when the sun sets, it is aligned due west at 9 p.m. and due north at 12 p.m. So the key point is the step of dividing by two, which unifies the time of day with the angular velocity on the dial, in fact, if you point 12 o'clock to the north beforehand, you will see that the sun travels from 3 o'clock to 9 o'clock in 12 hours.

What if there is no sun? The upgrade can also take into account the time difference.

At 6 o'clock in the morning, the sun is in the east, and the shadow points to the west, at this time, the hour hand on the watch points to the sun, and the "12" on the dial points to the west, if the dial is rotated 90 degrees, it is about to be folded in half at 6 o'clock, so that the "3" on the dial is facing the sun, and the "12" is pointing to the north; At 12 noon, the sun is in the south, and the 12 is folded in half, so that the "6" on the dial is facing the sun, and the "12" is pointing north.

However, it has also been suggested that the direction should be determined according to the method, and the local time difference should also be taken into account. Beijing time should be converted to local time. Based on the 120th parallel of east longitude, Beijing time is added by one hour for every 15 degrees of longitude to the east, and Beijing time is subtracted by one hour for every 15 degrees to the west.

For example, if the geographical coordinates of Urumqi are 87 degrees 40 minutes east longitude, then (120° 87°) 15° 2 hours and 9 minutes, subtracting 2 hours and 9 minutes from Beijing time, is the local time of Urumqi. However, the two methods cannot be used in Chiayi, Taiwan, Nanao Island in the northeast of Shantou, Guangdong, Wuzhou City, Guangxi, and the Tropic of Cancer (23 degrees 27 minutes north latitude) in Gejiu City, Yunnan.

The method of determining the position of the sun mentioned above will also fail once throughout the day, that is, if the sun happens to be on the zenith, it is impossible to determine the direction. And many netizens also asked what to do if you can't see the sun at night or on a cloudy dayThe reporter also found some ways to distinguish the direction at night and when there is no sun on the Internet, hoping to identify the direction for people who are not so sensitive to direction.

At night, the North Star is usually used to determine direction. To find the North Star, you must first find the Big Dipper, and along the direction of the spoon, there is a brighter star, which is the North Star, which points in the direction of due north. In addition to the stars, the moon can also be used to calculate bearings, but the method is quite complex and difficult for most people to use.

(Traditional watch with hands on the dial) mantra:

Half of the time is folded against the sun, and twelve o'clock refers to the north.

The method is to divide the time by 2, then find the corresponding position of the quotient on the dial, and then point it at the sun, the direction of the dial "12" is north, and the other directions can be deduced. For example, at 10 a.m., divide by 2 and the quotient is 5, and the 5 on the dial is aligned with the sun, and the direction of 12 is north. Once the north is determined, the other directions will be clear.

But keep in mind that if it's afternoon, it's a 24-hour count. If it is 4 p.m., it should be counted as 16 p.m. Finding directions in this way is no less accurate than a compass.

There are two ways to use a watch to identify the north.

They are the Guide Law and the North Law.

As follows: 1) Pointing to the north method, first put the watch flat, and secondly, point to the sun with half of the place where you are located, then the direction pointed at 12 o'clock at this time is due north.

2) Guide Law.

In the first step, the watch is laid flat, in the second step, the hour hand is pointed to the sun, and in the third step, the hour hand and the bisector line at 12 o'clock point to the south, and through these three steps the direction of the south is obtained, then the opposite direction is the north.

To sum up, there are two ways to use the watch to identify the north, namely the guide method and the north pointing method.

Here's how to distinguish the north of the watch:

In fact, through the watch, you can also estimate the direction of the large straight and guide the flight square. The hour hand pointing method uses the watch to estimate the direction, which can estimate the southeast, northwest, and the hour hand points to the sun, and the midline of the angle generated by 12 o'clock points to the south.

In some cases, airplanes need to wait in the air, and the original standard waiting is done in a timed manner. Therefore, the FAA (Federal Aviation Administration) stipulates that pilots' watches need to be accurate and have a second hand. If an accident occurs and the crew evacuates, the time needs to be accurate to the second, and everyone must have a precise time concept to prevent accidents.

Today's aircraft, especially fighter jets, fly at very fast speeds, even close to the speed of sound. High speed of flight, coupled with the influence of the Earth's magnetic field, can easily interfere with the electronic clock. A pilot's watch that is not susceptible to magnetic fields.

During the flight, you can observe the time between the two places and understand the specific time difference.

Method 1: Divide the time you see, divide by 2, find the position of the quotient on the dial, and then point it at the sun, and the direction of 12 o'clock on the dial is north. In the afternoon, the 24-hour timekeeping method is used.

For example, at 10 a.m., divide by 2, quotient 5, align 5 with the sun, and the direction of 12 o'clock is north. The method is simple.

Method 2: "The hour is half of the sun, 12 refers to the north", generally between 9 a.m. and 4 p.m., you can quickly identify the direction, with half of the time pointing to the sun, 12 hours is the north, such as 15:00 in the afternoon, half of which is 7:

30, the hour hand 7 o'clock to the sun, then 12 refers to the north, or the watch is flat, the hour hand points to the sun, the reverse extension of the hour hand and the 12 scale bisector is the north; Or put a watch, stand a small stick vertically on the watch** and turn the watch, so that the shadow of the small stick coincides with the hour hand, and the bisector between the hour and the 12 hours is the north. Precautions: When determining the direction, the watch should be flat; It should not be used around noon in areas between 20°30 north and south latitudes, that is, the standard time meridian shall prevail, and 1 hour will be added for every 15° to the east, and 1 hour will be subtracted from 15° to the west.

The daily maintenance of the watch must do the following 5 points: (1) When wearing the watch, the sweat on the hands is corrosive to the case, the all-steel case is nickel-chromium alloy, the corrosion resistance is better, the semi-steel case is copper, long-term contact with sweat, easy to corrode, should often wipe off the sweat with a soft cloth or pad the plastic watch holder to prevent it from being eroded by sweat. (2) Do not open the back cover of the watch at will, so as not to enter the movement and affect the normal operation of the watch.

3) Do not put the watch in a closet with mothballs to avoid the deterioration of the watch oil. (4) Do not put the watch on the radio or TV to avoid magnetization. (5) Watches that are not worn for a long time should be wound regularly once a month so that the parts will not be in a static state for a long time, so as to ensure the operation performance of the watch machine.