How do I measure distance with my thumb? What is the distance measured by the thumb from the index f

Thumb Distance Measurement Technique

The thumb measures the distance in turn with the left and right eyes, using the mathematical principle of similar triangles. When training, first find a series of objects with exact distances, then stretch out your arms, raise your thumb, first close your left eye to see the position of your fingers and the object, and then close your right eye to observe the position of your fingers and the object.

Based on this, the relationship between the actual distance and the position of the finger and the subject matter observed by the left and right eyes is determined. In actual use, the actual distance is judged by the relationship between the position of the finger and the subject matter observed by the left and right eyes respectively.

Tips. Straighten your arm forward and raise your thumb, close your left eye, your right eye, thumb, and target form a straight line, close your right eye, open your left eye, remember the point on the right side of the target with your left eye and thumb extending the straight line, visually measure the distance between that point and the target, and multiply by 10, which is the approximate distance you are to the target.

The arm is flattened, the gaze is about 120 denses between the fingertips and the horizontal line, look at the height of the target to estimate how many dense positions the line of sight passes through the top and bottom of the target, and multiply the target height by the target height (based on experience) is the target distance.

Translation distance The actual distance between the two eyes (about 10cm) = the actual distanceReach(i.e. the length of your arm).

Another: Suppose there is a tree n meters away from us, measure our distance to this tree:

1. Raise our right arm horizontally, make a fist with our right hand, and give a thumbs up.

2. Use your right eye (left eye closed) to overlap the left side of your thumb on a straight line with the tree.

3. If you don't move your right arm and thumb, close your right eye, and then use your left eye to observe the left side of your thumb, and you will find that this edge is some distance away from the right side of the tree.

4. Estimate this distance (this can also be measured), and count this distance to 10, which is the approximate distance we are from the lesson tree.

It is said that this "thumb ranging method", after being proficient and correctly mastered, within 1000m, the measurement result is within 1m.

The thumb refers to the first finger of the hand, and the thickest and shortest finger is the thumb, which helps us hold things. The thumbs up gesture is almost universally recognized as a message that is good, high, wonderful, everything is going well, very good, and so on.

Example: "Guangyun Shanghou": "Thumb, thumb also." ”

The second and sixth episode of "Water Margin": "Wu Song.

The four fingers of the right hand are caged, and the thumb is pressed to cover the heart. ”

The Legend of the Heroes of Children

The sixth time: "It turns out that Gongzi An is still sitting in that place, with two thumbs blocking the door of his ears, and those eight fingers holding his eyes to hide cats there!" ”

Wei Wei. The East, Part 4, Chapter 21: "With heartfelt admiration, he gave a thumbs up and said: 'Korean women, great good! Also say "thumbs up".

The fifteenth chapter of "The Biography of Children's Heroes": "Deng Jiugong.

He gave a thumbs up and said, 'High! Thumbs up, usually a sign of approval and admiration.

Thumb distance measurement"Distances are measured according to the rectangular trigonometric function. Here's how we measure our distance to the target:

1. Raise our right arm horizontally, make a fist with the right hand and stand up the thumb 2. Use the right eye (left eye closed) to overlap the left side of the thumb with the target in a straight line;

3. If the right arm and thumb do not move, close the right eye, and then observe the left side of the thumb with the left eye, you will find that the edge line is a distance away from the right side of the target;

4. Estimate this distance (this can also be measured), and the distance is 10, which is the approximate distance we are from the target.

Similar triangle principle ranging; Your arms plus thumbs can be seen as the sides of a triangle. In general ranging, the thumb and arm are perpendicular, that is, the two sides of a right triangle are known. At this point, you need a piece of data to measure the distance.

This data can be estimated by yourself or obtained using multiple ranging equations.

The observer faces the target, stretches out the thumb of the right hand between the eyes, closes the left eye, uses the right eye to aim at the target through the side of the thumb, and then uses the left eye to observe through the same side of the thumb, remembering the object that the left eye is looking at, estimating the distance between the object and the target, and then multiplying by 10 times, which is the target distance.

This method is based on the distance between the two pupils of a person about one-tenth the length of our own arm, and then multiplies the width of the actual object measured by 10, so that the approximate distance between your position and the position of the object you measure can be roughly calculated.

Everyone's vision is not exactly the same, so there is no accurate data to describe this method, which requires training and continuous exploration and practical exercises to make the data you measure more accurate.