People who like the outdoors must have seen a lot of wild ways to identify the direction on the Internet, Dongge is, understand a lot of wild identification of direction skills, such as looking at the trunk of the annual ring, looking at the trunk of the leafy foliage, looking at the direction of the spider web, etc., in short, each has its own principle, but it is not easy to use when used, for example, in the wild it is difficult to find a flat trunk with a cut, and it is also thick, we can not always be a tree for a direction, that is not tired, the other two are not very easy to use, everyone has used it to know.
The method introduced by Dongge today is the watch method, at first I didn't believe much, but after knowing its principle, well, Dongge feels very reliable, and I took it to share with you.
Remember that watch identification can only be a general direction, and if you want to be very precise, you have to rely on a compass. In addition, there are requirements for location, that is, north of the Earth's Tropic of Cancer.
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Introduction to the principle of the method:
The watch to distinguish the direction is the scale of the watch (the digital meter can not be used), we all know that there are 12 numbers on the dial of the watch,
If we think of the dial as a plane, with the center as the dot, then it happens to be 360 degrees, and 360 is evenly distributed on these 12 numbers, then 360/12 = 30 degrees, that is, the degree between each number on the dial is 30 degrees.
Let's look at the earth again, the earth rotates 360 degrees, the time is about a day, that is, 24 hours, on average, then an hour of time The degree of rotation of the earth is 360/24 = 15 degrees.
If it is north of the Tropic of Cancer, then we all know that the sun is in the due south direction at 12 noon, remember, this refers to local time, so at 12 noon, point the clock hand to the sun, then the hour hand at the same time refers to the due south direction.
example
So at 16:00 in the afternoon, where is due south? At this point, we point the hour hand of the watch to the sun (after putting it away, we keep it still), and then we first calculate in our minds how many degrees the sun has gone, which is easy to understand, 4 * 15 degrees = 60 degrees. Then we start from the 12 o'clock scale of the watch disc and push back 60 degrees, and the position at this time is about 2 o'clock, so the direction of 2 at this time is due south.
Of course, sometimes the hour hand is not on a fixed number, but between 3 and 4, which is also very good to calculate at this time, and we just need to recalculate.
If we calculate the scale of the watch disc not by the hour, but by the minute, then there are 12 * 5 = 60 small cells on the dial, 360 / 60 = 6 degrees. 1 hour and 60 minutes, and 1 hour hand walks 5 small cells, so that the hour hand takes 60 * 5 = 12 minutes per small grid.
The Earth rotates 360 degrees, the time is 24 hours, each hour is 60 minutes, that is to say, the Earth rotates for 1440 minutes, and then 360/1440 = 0.25 degrees, that is to say, the Earth rotates 0.25 degrees for 1 minute.
Example
Let's first point the hour hand of the watch to the sun, if the hour hand falls on the third scale between 2 and 3, then the hour hand goes 13 small cells, each small grid 12 minutes, 13 * 12 = 156 minutes.
Then the sun walks 0.25 degrees per minute, and 156 minutes is 156 * 0.25 = 39 degrees.
And each small grid on the watch plate is 360 * 60 = 6 degrees. 39*6=6.5, so we start counting 6.5 cells from 12 on the dial, which is due south, probably a little after 1 o'clock.
The above method is for reference only, the first is relatively simple, the second is more brain-circumventing, Dongge recommends that you try to use the first one.