Method 1: Divide the current time by 2 and aim the quotient at the sun. The direction of 12 on the dial is north. For example, it's 8 o'clock in the morning. Divided by 2, the quotient is 4. Aim the 4 on the dial at the sun, and the direction 12 is the north. If it is in the afternoon, it will be calculated by 24-hour timing.
Method 2: In the northern hemisphere, place the watch horizontally, with the hour hand pointing to the sun, and the bisector of the included angle between the hour hand and 12 points refers to the north-south direction.
Note: to determine the direction by the above method, you must use accurate local time, such as Urumqi local time is 2 hours and 9 minutes less Beijing time; In addition, these methods can't be used in the south of the Tropic of Cancer, because the closer to the equator, the almost direct sunlight, and it is difficult to tell the direction with a watch.
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How to tell the direction with a watch hand?
Pointing the direction with the pointer of a watch: Method 1: Divide the time by 2, and the pointer of the number is aimed at the direction of the sun, then the direction of 12 is the north. For example, at four o'clock in the afternoon, that is, 16 o'clock, divide by two to get 8. If you aim at 8 o'clock in the direction of the sun, the direction of 12 is the north. Method 2: (Northern Hemisphere) Place the watch horizontally, with the hour hand pointing to the sun, and the direction in which the hour hand extends in the opposite direction to the bisector of 12 is the north. (Southern Hemisphere) Align 12 with the direction of the sun, the direction opposite to the included line between 12 and the hour hand is due south, and the reverse direction extends to due north. Other methods to identify the direction of missing data 1, shadow clock method: place a vertical trunk with a length of 1 meter vertically on a flat land. Mark the position of the shadow and mark the top with a stone or stick. 15 minutes later, mark the new projection position of the top of the trunk on the ground. The connection between two points will give you the east-west direction ―― mark the west first. 2, making a simple compass: in the absence of the sun, you can use a small iron wire to fully rub with the hair to magnetize it, and then put it on a leaf, and then let the leaf float in still water. The magnetized iron wire will make the blade rotate slowly until it is aligned with the north-south direction, and then identify the specific direction by other methods. A wire (or sewing needle) rubs silk repeatedly in the same direction, which will produce magnetism and can indicate the North Pole when hung. The magnetism will not be very strong, so it needs to be wiped again every once in a while to increase the magnetism. If you have a magnet, it will be more effective than silk-pay attention to rubbing the magnet with an iron needle in the same direction. Hang the magnetic needle with a rope to avoid affecting the balance. But don't use twisted or twisted ropes. 3. Scientific use of the compass needle: When the magnetic needle of the compass needle is at rest, its N-end (usually marked) refers to the north. It is very simple and quick to tell the direction with a compass, but pay attention to: 1. Try to keep the compass level; 2. Don't be too close to iron and magnetic substances; 3. Don't mistake the S end of the magnetic needle for the north, which will lead to the misjudgment of the direction of 180. 4. Visual observation: 1) Observation of celestial phenomena: The most common observation of celestial phenomena is the observation of Polaris. At night, under the moonlit night sky, we will always find the Beidou constellation that looks like a spoon. There is a bright star at the end of the spoon seven times away, that is, the Polaris, which is directly below the north, and clockwise is east, south and west. 2) Observe the sun: Every day the sun rises and sets in the west ―― but it is not due east or due west. There are some seasonal deviations. When the sun reaches its highest point at noon, it is just south of the northern hemisphere. In the southern hemisphere, it lies due north. The difference between the northern hemisphere and the southern hemisphere can be determined by the movement of tree shadows: the northern hemisphere moves clockwise and the southern hemisphere moves counterclockwise. Shadows can be used to determine direction and time. 3) observation tree: you can find a stump to observe, and the width of the annual ring is south; Or find a tree with lush foliage on the south and sparse foliage on the north. 4) Observation of rocks: In places with many rocks, you can also find an eye-catching rock to observe. The moss-covered side of the rock is the north side, and the dry and bare side is the south side;