The length of the sun shadow at the beginning of winter

In early winter, the shadow of the sun is one foot and two inches long. If we can't reach this length, there will be cold in long summer, early warning first, and then flood, and everything will fail; If it should not arrive, people will have many arms and sick palms.

The length of the sun shadow is measured by the sundial. In ancient times, the length of a sundial was unknown. One view is 180 cm and the other view is 187.5 cm. It is used to measure the length of the sun shadow every day of the year, and the length of the sun shadow is used to determine the basis of the 24 solar terms and other seasonal changes.