Tilt angle of sundial device

I. Pictures of seasonal sundial products

The seasonal sundial is positive.

Side of seasonal sundial

Second, the product full name

Full name: One-sided solar term equatorial sundial, which is a patented product of our company. It can not only be widely used in primary and secondary education and teaching, but also be used as an advanced astronomical education toy and children's DIY model. It is a rare small astronomical instrument! Welcome schools, science and technology venues, popular science departments, parents and friends to consult and buy!

Third, the product code

As an instrument added in the new catalogue of the Ministry of Education, the sundial code is: 120 15, which is temporarily listed as a physical instrument. In fact, both primary school science and middle school geography are applicable. For example, Zhejiang Science Edition, East China Normal University Edition, Jiangsu Education Edition and Shanghai Edition all have related contents. Because expert Lu Peiqi said that this knowledge point is included in the curriculum standard of science, no matter what version of the textbook will have related knowledge points, so this instrument has strong applicability.

Seasonal sundials are more adaptable!

Four. Recommended by authoritative experts (see the figure below, text omitted)

Verb (short for verb) How to use this product?

1, facing north. North-facing scale surface;

2. Adjust the guide rail. Adjust the base of the sundial so that the compass pointer points due south;

3. Adjust the level. Adjust the left and right cap screws to adjust the small bubbles in the bubble of the level meter to a small circle;

4. Adjust the latitude. First check the latitude of the surveyor's location on the map, for example, the latitude of Jiangyin is 32o, and that of Beijing is 40o；; Then adjust the inclination of the masonry surface so that the rear edge of the column is aligned with the degree on the latitude plate; Finally, tighten the screws at both ends of the column to fix the latitude. At this time, the angle of inclination of the coffin relative to the ground is exactly (90 degrees of local latitude). At this time, the coffin needle just tilted at the latitude angle, pointing to the Polaris parallel to the earth axis and the coffin plane parallel to the equator.

5. Watch movies regularly. At this time, in the sun, we can look at the needle shadow on the surface and set the time. The patented product design combines the traditional twelve-hour clock with the modern twenty-four-hour clock. It also makes people understand the traditional concept of time measurement today. In the twenty-four system, an hour is divided into twelve cells, each cell is five minutes, one cell is ten minutes, and an hour is exactly six cells; Twelve-hour system, 15 minutes per grid, two hours is equivalent to one hour in ancient times.

6, immediate. Adjust the travel schedule so that the needle shadow falls on the center line of the travel schedule, and determine the solar terms at that time according to the solar terms indicated by the position of the shadow tip. Compared with the standard watch, this instrument can observe the shadow at any time with the sun to confirm the solar terms, while the standard watch can only confirm the solar terms in the positive meridian direction at noon and local time.

Note: (1) The time we measure here is local time, not Beijing time;

(2) This is a one-sided sundial. When the needle shadow cannot fall on the surface of the sundial from the autumnal equinox to the vernal equinox, the face facing north is already in the shadow. At this time, you can also adjust the platform so that the needle shadow of the sundial falls on the center line of the platform, and then determine the local time according to the grid where the center line intersects the sundial surface, which makes up for the shortcomings of other single-sided sundials.

Sixth, the characteristics of seasonal sundials

1, integrating sundial and standard table;

2. Integrating tradition and modernity;

3. Integrate learning tools and toys;

4. Practice your hands and brains for a while.

This sundial is small and exquisite, beautiful and generous, easy to disassemble and carry. With the change of geographical position, it can be observed at any latitude, so it can be carried to any latitude area on the earth for use. The existing stone sundial is difficult to move and adjust.

Seven, special functions

This product involves observing the shadows of objects in the sun, as well as observing time and solar terms. It is suitable for the teaching of natural science in primary schools and astronomy and geography in middle schools. It can also be used as modern ornaments and children's scientific toys to stimulate children's interest in learning and exploring astronomy and geography, and also to understand some mysteries between heaven and earth that modern clocks and watches can't reflect.

Some uses are as follows:

(1) When looking for a house in a different place.

(2) The solar altitude angle can be measured.

(3) Measure the differences between the two places.

④ Measure the magnetic declination.