Copper plated cashew shaped equatorial dial

[Copper plated cashew shaped equatorial public dial]

The copper plated cashew shaped equatorial public dial was made at the Palace of the Qing Dynasty in the Qianlong period of the Qing Dynasty, with a side length of 15 cm and a maximum width of 9.5 cm. The old collection of the Qing Palace
This bronze ware is gold-plated, and its base is cashew shaped. The sundial is equipped with a compass on one side and a dial plate on the other. The dial needle is set on the top. The intersection angle between the dial plate and the base surface can be adjusted according to the latitude of different regions. There is a hollowed-out arc between the “mao” and “you” of the dial. Its function is to observe the position of the needle shadow between the time lines at any time, especially on the days near the spring and autumn equinoxes, so as to improve the accuracy of time measurement.

铜镀金腰果形赤道公晷仪晷盘