How to make a simple standard?

The method of making simple standard watches is as follows:

1. Draw a scale on the Guimian paper board with a ruler to make Guimian scale paper. When making standard watches, the cardboard used to make "watches" must have enough hardness.

2. Cut one end of the surface model in the middle, fold it in half to both sides respectively, and stick it to the Guimian scale paper with double-sided adhesive tape. Note that the table is aligned with the "0" scale on Guimian.

3. Prepare a plastic board. Then print the clock. Cut the clock according to the outline. Glue the clock to the bottom of the plate with Tauren glue. Then prepare a pencil. Glue the pencil to the center of the clock. Put your watch in a sunny place. As the sun moves, the shadow of the pencil moves on the watch and indicates the time.

4. Simulate and measure the shadow length of the four seasons. According to the experimental data, draw the "shadow length" line graph. According to the characteristics that the position of the sun changes with the seasons at noon in the same place, simulate the change of shadow length (pay attention to the position of the sun and the illumination angle) and complete the record table.

A brief introduction of the standard table is as follows:

Ghost table is an astronomical instrument for measuring the length of the sun shadow, which consists of two parts: ghost table and ghost table. Like the sundial, the sundial is an ancient astronomical instrument, which uses the shadow of the sun to measure. The ancient sundial (sundial instrument) in China consists of a slender dial (GUI) and 1 or two benchmarks (watches), which are used to measure the length of a year and the time of 24 solar terms.