Lost in the wilderness, how can you judge the direction and southeast and northwest with a watch!

The specific method is to point the hour hand (short hand) of the watch at the sun, and the hour hand and the watch are on it"12 o'clock"(the line with the center of the watch) forms an angle, and the angle bisector of the angle points in the direction of the angle"Due south".This applies at any time (all year round, morning or afternoon) The specific method is to divide the time at that time (24-hour clock) by 2, and then divide by 2 (e.g. 2 p.m. is 14 o'clock, divide by 2 is 7 o'clock, and then use the 7 o'clock scale) to align the direction of the sun, and then the 12 o'clock scale (which is the direction of the strap) is the direction of the north. Conversely, the 6-point scale refers to the south.

Normally, the sun is in the east at 6 a.m., south at 12 noon, and west at 18 p.m. In the field, as long as there is a watch and there is the sun during the day, you can take the watch off and put it on the palm of your hand, and align the scale of the watch with the sun after the time is halved, and dial 12 refers to the north. For example:

It was 14 o'clock and you had to look for directions, and the time was halved to 7 o'clock. This should be pointed to the sun on the dial with the scale 7 on the dial, and 12 on the dial refers to the north. To be more precise, you can use a thin, straight needle or twig to stand on the point where the hour is halved and slowly turn the clock so that the shadow of the needle passes through the center of the dial.

At this time, the center of the dial and the 12-scale extension direction is north.

Wait until your watch shows noon and look at the sun.

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.

According to this method, the direction is determined, taking into account the local time difference. 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, and Beijing time minus 2 hours and 9 minutes, is the local time of Urumqi.

The above two methods cannot be used in the area south of the Tropic of Cancer (23 degrees 27 minutes north latitude) in Chiayi, Taiwan, Nanao Island, northeast of Shantou, Guangdong, Wuzhou City, Guangxi, and Gejiu City in Yunnan.

By the way, we know that the Earth and the Sun move 15° relative to each other during the rotation of the Earth, and we can roughly determine the direction with a watch and the Sun. Conversely, we can also determine the approximate time with a compass and the sun. To do this, use a compass to orient the sun north, and divide the reading of the sun's bearing by 15.

In China, Beijing time is the standard, Beijing is on the east longitude 120 ° line, and other regions should be corrected according to the longitude difference, that is, the correct solar time.

Talent, when did you find this kind of watch and tell me.

The direction finding of the watch "the hour folds half to the sun, 12 refers to the north", generally between 9 a.m. and 4 p.m., the direction can be quickly identified, with half of the time pointing to the sun, 12 hours is the north, such as the time of 14:40 in the afternoon, half of which is 7:20, the time is directed to the sun, then 12 refers to the north, or the watch is flat, the hour hand points to the sun, and the reverse extension direction of the hour hand and the 12 scale bisector is 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.

The earth rotates 360 degrees in 24 hours, so 1 hour is 15 degrees, and the watch rotates 360 degrees in 12 hours, that is, it is 1 times faster than the sun. At 6 o'clock in the morning, the sun is in the east and the shadow points to the west, and if the dial hour hand 6 points to the sun, 12 on the dial points to the west; If the dial is rotated 90 degrees, i.e. 6 divided by 2 to 3, then 3 points to the sun, and 12 refers to the north; Also at 12 noon, the Sun is in the south, and dividing 12 by 2 is 6, then 6 points to the Sun and 12 points to the north. The disadvantage of determining the direction according to this method is that it is best to consider the local time difference to avoid deviations in orientation, but it may be used as a simple judgment of the approximate direction.

It must be noted that: 1) When determining the direction, the watch should be flat;

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

First stick a branch in the ground, and use the time of the watch to point at the shadow of the branch, so that the hour hand is reunited with the shadow.

At this time, the bisector line between the hour hand and the 12 o'clock angle of the watch points to the direction of the south, "the watch must coincide with the local time, and the error is not too large".

Use the sun and watch to determine direction: During the day, if you are wearing a watch, you can use the watch and the sun to determine direction. Lay the watch flat so that the time is facing the sunlight (the direction in which the light is coming or the opposite direction of the figure), and then divide the angle between the hour hand and the 12 o'clock on the watch, and the direction of this bisector is the south (this method is applicable to the area north of the Tropic of Cancer and the time similar to the time zone of Beijing).

So, what is the principle of this method?

In areas north of the Tropic of Capricorn, the Sun is located due south at 12 o'clock local local time, and the Sun moves about 15 degrees west every hour, so that the angle at which the Sun deviates from due south can be estimated from the time of day, and then the watch is used as a protractor (the one-hour interval on the watch is 30 degrees). For example, at 10 a.m., the sun should be 30 degrees east-south, 30 degrees clockwise at 10 o'clock in the south, and after 12 o'clock (afternoon), it should rotate counterclockwise at the corresponding angle due south. Note that the time here must be local, or the time used is close to the locality.

The watch is placed flat, pointing to the sun at half of the local time, and the direction at 12 o'clock is north.

Principle] 0 o'clock local time is due north, the sun rotates once, the watch hour hand turns 2 times, and the watch time is divided by 2, which is the direction of the sun.

Compass] When the watch is laid flat and the hour hand points to the sun, the hour hand and the bisector line at 12 o'clock points south.

Principle] 12 o'clock local time is due south, where it is less than 12 o'clock or more than 12 o'clock, the angle of the hour hand from 12 o'clock is twice the angle of the actual sun from noon.

Example] 16 o'clock on a certain day.

Pointing north: Point to the sun at 8 o'clock and north at 12 o'clock.

Guide: Point to the sun at 16 o'clock and south at 14 o'clock.

Note: Regarding the Guide Law, the Guide Law is to be used between 6 and 18 o'clock when the local time is located. For example, when the sun is seen at 3 o'clock local time, the 3 o'clock clock on the hour hand points to the sun, and the bisector line at which 3 o'clock and 12 o'clock form an angle points to the north.

As for the example of pointing north, at 12 noon, 6 points to the sun and 12 points to the north; At 4 p.m., point 8 to the sun and 12 to the north. At 0 o'clock, 12 refers to the current position of the Sun at this time, i.e. the midnight meridian. This method can also be used in polar daytime regions (except for poles).

On the question of error: there is nothing wrong with this principle itself, the error occurs because we do not consider the difference between local time and Beijing time when we look at the watch. The time difference is calculated according to the longitude difference between the local longitude and the 120 meridians taken in Beijing time, and then the above method can be used to judge the correct direction when the local place is subtracted from east and west.

For example, if it is 35°N or 110°E in a certain place, it is 12 o'clock Beijing time at this time. When judging the direction, you should first calculate the local time as 12 o'clock - (120 ° - 110 °) 4 minutes = 11 o'clock 20 minutes, and then use half of the time of 11:20 that is, 5:40 to face the sun at this moment, then the direction of 12 o'clock on the dial is of course more accurate 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, 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 with the sun" on the dial, and the direction of the 12 is 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 his back to the south, he is facing the north, the left hand is west, and the right hand is east.

It's as simple as dividing the current time on your watch by 2, then finding the corresponding position of the quotient on the dial, and then pointing this number at the sun, where the "12" dot on the dial points to north.

For example, at 10 a.m., divide by 2, and the quotient is equal to 5. Align the "5 with the sun" on the dial, and the direction of the 12 is 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.

Up and down to the south, left to the west and right to the east, everything is very clear.

Orient with the watch and the sun If the person in distress does not have a map and compass, and cannot find a reliable georeference, the watch and the sun can be used to orient themselves during the day. Here's how: Lay the watch flat with the hour hand pointing to the sun (the direction the rays are coming from) and imagine a line bisecting the hour hand at the angle of 12 o'clock.

For example, if it's 8 a.m., the dividing line will pass 10 a.m. For example, in the Southern Hemisphere, the direction of the dividing line is due north; In the Northern Hemisphere, the direction of the dividing line is due south. If daylight saving time is in place in your area, slow down your watch by one hour.

In the Northern Hemisphere, the sun is generally in the east around 6 o'clock local time, the sun is south of the zenith at around 12 hours, and the sun is in the west at around 6 p.m. In the north and south spheres, the sun is in the east around 6 o'clock, the sun is in the north at the zenith at around 12 o'clock, and the sun is in the west at about 18 o'clock. This can also give you an approximate orientation.

If the victim's watch is damaged or inaccurate, the time can be determined with the compass. First, measure the azimuth of the sun, divide the angle of the sun for 1 hour by 15 and add 1, and the resulting value is the local time. For example, if the azimuth of the Sun is measured at 180°, the local time is 180 15 1 13 hours. Seek adoption.

During the day, you can chop down a small tree with an axe and determine the direction by reading the rings of a book. You can look at the stars at night, and many stars and constellations can determine the direction.