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Pinyin rü gué

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(1) The shadow of the sun.

A?vagho?a Xi Zhong's Biography of the Wolf in Zhongshan: After a long stalemate, the sundial gradually moved.

② sundial. An ancient instrument for measuring the time of sun shadow. Also refers to the sun.

Liu Tang Zongyuan's question and answer article: "At dawn, the British and the elite circled each other, swaying and shooting, the weather was all white, the sun was small, and the clouds broke."

The sundial, or sundial, is an ancient time measuring instrument in China. It uses the shadow of the sun to measure time. It usually consists of a copper pointer and a stone disk. The pointer made of copper is called "Gong Pin", which passes through the center of the disk vertically and acts as a neutral rod in the standard watch. Therefore, Gong Pin is also called "table", and the disk made of stone is called "Gong Mian". On the stone platform, the stone platform is high in the south and low in the north, making Gong Mian parallel to the equatorial plane of the sky. In this way, 12 large squares are carved on the front and back sides of the brick surface, and each large square represents two hours. When the sun shines on the sundial, the shadow of the sundial needle will be cast on the surface of the sundial, and the sun will move from east to west, and the shadow cast by the sundial needle on the surface will slowly move from west to east. Therefore, the moving shadow of the coffin needle seems to be the pointer of modern clocks and watches, and the coffin surface is the surface of clocks and watches to show the time.