CN2508220Y - Needle for directing Mecca - Google Patents

Abstract

A pointing Mecca needle relates to a pointing needle. The pointer of the compass is provided with a turntable, the turntable is provided with a pointing arrow and rotates together with the pointer, and the turntable is a thin circular plate and is made of one of plastic, aluminum alloy or paper material. The utility model has the advantages of simple structure, convenient carrying, accurate pointing, etc.

Description

pin pointing to mecca

The utility model relates to a pointing needle.

When Muslims all over the world pray, their faces must face toward Mecca. At present, there are millions of people in Xinjiang and other ethnic minority areas in my country who believe in Islam. For Muslims in Xinjiang, when they determine the direction of Mecca, they always look for it according to the location of the local sunset. We know that the orientation of sunset will not be the same point for the same place throughout the year, so it is inaccurate and inconvenient to use this method to determine the direction of Mecca. Especially when going to nearby cities or traveling abroad, it is difficult to identify the direction, which brings a lot of troubles to the daily life of Muslim compatriots who go out.

The purpose of this utility model is to provide a pointer to Mecca with a simple structure, easy to carry, and can accurately point out the direction of Mecca city.

The purpose of this utility model is accomplished through the following technical measures.

A turntable is arranged on the pointer of the compass, and a pointing arrow is arranged on the turntable, and the turntable rotates together with the pointer.

The turntable is a thin disc.

The turntable is made of one of the following materials: plastic, aluminum alloy or paper stock.

The utility model is marked with a pointing arrow on the turntable, and the direction of the arrow is the city of Mecca, and the angle between the pointing arrow on the turntable and the magnetic pointer of the compass is determined by the position between the central area and the city of Mecca. When using it, first calculate the included angle between the Mecca city direction and the compass pointer, and fix the turntable on the pointer according to the degree of the angle. At this time, the included angle reflected by the arrow and the pointer is the calculated degree. Because the turntable rotates with the pointer, no matter where you go, the arrow will always point to the city of Mecca. The turntable can be made of light-weight materials that have good strength and do not interfere with the surrounding magnetic field.

The calculation method of the included angle between the arrow and the pointer on the turntable of the utility model is as follows:

1. On a flat world map, calculate or find out the exact coordinates of the city of Mecca.

2. Choose a place in the center of the region where you live, and calculate or find out its coordinates.

3. Draw a shortest straight line from Mecca to the center point of the selected area. This straight line (as hypotenuse) is in line with the local

Draw a right-angled triangle with the coordinates of Mecca in the southeast and northwest, and calculate it by the cosine formula of the right triangle

The angle between the location and the local north-south line.

4. According to the calculated included angle, stick the turntable on the pointer. At this time, the included angle reflected by the arrow and the pointer is

It is the number of included angles calculated by the calculation formula, and attention should be paid to the direction of the included angle.

Example: The following data is measured with a ruler based on a world map

Coordinates of Mecca (39.69°, 21.50°)

As far as Xinjiang is concerned, Muslim compatriots mainly live in the north, so Urumqi is regarded as the center

The location, whose coordinates (87.23°, 42.05°) calculate the angle:

θ=arctg(|(87.53°-39.69°)|/|(42.05°-21.50°)|)=66.75°

According to the above calculation results, when making the pointer to Mecca for Muslim areas in Xinjiang, the angle between the arrow on the turntable and the pointer should be 66.75° to the west. That is, the angle is 66.75° south by west.

5. If the whole world is divided into 36 districts with Mecca as the center, it will be made according to the average angle of each district

The needle pointing to Mecca, if it is used in some countries within the specified small area, the accuracy of its pointing to Mecca

It is more than 95%, (the error is at most 5%), because the average angle refers to the respective angles of the two tangents of a cell

The average angle of the angle of a point of tangency.

If the world is divided into 72 cells, the accuracy can be increased by more than 97.5%.

The utility model has the advantages of simple structure, convenient portability, and the ability to accurately point out the direction of the city of Mecca.

The following is a description of the attached drawings:

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a schematic diagram of the structure of the turntable in the utility model.

Among them: 1. Turntable, 2. Arrow, 3. Pointer, 4. Compass base.

The following structural drawings further illustrate the utility model.

The structure is shown in Figure 1 and Figure 2, which consists of the pointer 3 of the compass, the base 4 and the turntable 1. A turntable 1 is arranged on the pointer 3, and a pointing arrow 2 is arranged on the turntable, and the turntable rotates together with the pointer. The turntable is made of plastic with good strength and does not affect the surrounding magnetic field. The arrow marked on the turntable points to the city of Mecca. After calculating the angle between the direction of Mecca and the compass pointer, fix the turntable on the pointer. At this time, the angle between the arrow and the pointer is calculated. degree. Since the turntable rotates with the pointer, no matter where you go, the arrow will always point to the city of Mecca.

Claims (3)

1. A needle pointing to Mecca is characterized in that a rotating disk is arranged on the pointer of the compass, and a pointing arrow is arranged on the rotating disk, and the rotating disk and the pointer rotate together. 2. The needle pointing to Mecca according to claim 1, characterized in that, said rotating disk is a thin disc. 3. The needle pointing to Mecca according to claim 1, wherein the turntable is made of one of the following materials: plastic, aluminum alloy or paper.

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