Little koala got lost. What are the ways to tell the direction?

1, if possible, compass and GPS are the most convenient and fast.

2. Using the sunny sun, you can easily know the east and the west according to the sunrise and sunset, and you can also judge the direction, but it can only be a rough estimate.

3. Watch direction finding "hour and a half refers to the sun, 12 refers to the north". Generally, you can quickly identify the direction between 9: 00 am and 4: 00 pm, pointing in the opposite direction to the sun half the time, and 12 is the north. For example, in the afternoon 14:40, half of it is 7:20, and the time is targeted. Or put a watch, put a stick in the center of the watch to turn the watch, so that the shadow of the stick coincides with the hour hand, and the bisector between the hour and 12 is the north. The earth rotates 360 degrees in 24 hours, so 1 hour is 15 degrees, while the watch rotates 360 degrees is 12 hours, which is 1 times faster than the sun, so that the position can be roughly determined by the watch and the sun. At 6 o'clock in the morning, the sun is in the east and the shadow points to the west. When the hour hand 6 of the dial points to the sun, 12 on the dial points to the west. If the dial is rotated 90 degrees, that is, 6 divided by 2 equals 3, then 3 points to the sun, and at this time 12 refers to the north; Similarly, at noon 12, the sun is in the south. Divide 12 by 2 to get 6,6 points for the sun and 12 points for the north. The disadvantage of this method is that it is best to consider the local time difference and avoid azimuth deviation, but it may be used as a simple judgment of approximate azimuth.

It must be noted that (1) when judging the direction, the watch should be flat; (2) In the area between 20 30' south latitude, it is not suitable for use around noon, that is, every 15 plus 1 hour in the east and every 15 plus 1 hour in the west.

The direction of the sun shadow is sunny, and a wooden stick is erected on the ground. The shadow of the stick moves with the position of the sun. These shadows are the shortest at noon, the connecting line at the end is a straight line, and the vertical line of the straight line is the north-south direction. Draw a series of concentric circles on a piece of 50×50cm drawing paper, with the radius of concentric circles increasing by 1cm, nail them horizontally on a flat plate, and vertically insert a thin steel needle or needle with a length of 12- 15cm on the center of the circle. When the position of the sun changes, the endpoint of the shadow always intersects with the concentric circles. Draw these points, then connect two straight lines on the same circle, and connect the midpoint of these straight lines with the center of the circle. This connecting line is the north-south direction line, and the direction of the arc top is the north.

5. When the night star is at night, you can judge the direction according to Polaris and Southern Cross.

1, Polaris is located in the northern sky, and its exposed altitude angle is equivalent to the local latitude. Based on this, you can find Polaris quickly. Usually according to the Big Dipper (Ursa Major) or the W Star (Fairy Queen). The Big Dipper is seven bright stars, shaped like a spoon. The place where the two β -α directions of the spoon extend about 5 times is Polaris. When you can't see the Big Dipper, you can look for the North Star according to the constellation W after Fairy. Cassiopeia consists of five bright stars, shaped like a "W" letter, and the distance between the opening direction and the opening width of the letter is about twice that of Polaris.

2. The Southern Cross is located in the south of 23 30' north latitude, and sometimes it can be seen at night. It is composed of four brighter stars, which are cross-shaped. At the lower right, four and a half times (no stars) of the line from γ to α is due south.

6. Ground features and plant features Sometimes some ground features and plant growth features in the wild are good direction signs. Increasing this knowledge can help you quickly identify the direction.

1. Architectural features: Generally, the gate faces south, and the doors and windows of the larger temples and pagodas in the north and rural independent houses face south. On the grassland, the doors of Mongolian yurts mostly face southeast. Temples: usually open to the south, especially the main buildings in the temple group; Remarkable features: Bryophytes, whose base is wet to the north, may grow low. For buildings and mounds, the snow in the north melts slowly, but in depressions such as potholes, the situation is just the opposite. There are many northwest winds blowing in the grasslands and desert areas in northern China, and many snow dragons and salons often form near the grasslands. They have big heads and small tails, and their heads point northwest.

2, plant growth characteristics As the saying goes: "Everything grows on the sun", after mastering this characteristic, even on a cloudy day without the sun, you can judge the direction by observation. For example, the grass in the south of big stones and tree trunks grows vigorously, and the grass in the south withers faster in autumn; Bark is generally smooth in the south and rough in the north. There are many cracks and protrusions on the northern bark of some trees, which is especially obvious in birch. The gum resin from conifers and firs on the trunk is more in the south than in the north, which is easy to form a larger block; In autumn, many fruit trees bear more fruits facing south, especially apples, red dates, persimmons and oranges. The fruit changes color first when it is ripe. Moss growing on stones likes humidity, and the north is more prosperous; Most of the snow melts in the south first; Generally, on the shady slope, that is, the northern slope, low ferns and vines are more developed than on the sunny slope. The northern edge of the clearing in the forest is dense with grass. A plant has lush leaves on the sunny side, and moss may grow on the shady trunk in the north. Independent trees are usually lush in the south with smooth bark; The leaves in the north are sparse and the bark is rough. In the south, grass is usually lush, in the north, it is wet and covered with moss. Many trees in northern China have clear annual rings on their trunks. The rings on the south side are sparse and those on the north side are dense. Generally speaking, the tree ring pattern on the cross section of the stump is separated in the south and smaller in the north. If you get lost on a cloudy day, you can know your position by the growth of moss on trees or stones. As far as the trees in the northern hemisphere are concerned, the leafy side is the south. If you cut down a tree, the side with wide rings and wet moss is the north.

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