How to mark 24 solar terms on the self-made standard?

1. Prepare a flat surface, such as a piece of cardboard or plastic board.

Draw a circle on the surface to represent a complete solar orbit.

3. Divide the circle into 24 equal parts, each of which represents a solar term.

4. Write down the corresponding names of solar terms on each bisector.

5. In the center of the circle, fix a thin stick or pencil.

6. At the top of the thin rod, fix a small shadow mark, such as a small piece of paper or a small clip.

7. Place the watch in a sunny place to ensure that the sun can shine on the shadow mark.

8. Observe the position of the shadow when the sun shines on the shadow mark. According to the position of the shadow, we can determine the current solar terms.