晷针

这样，晷针的上端正好指向北天极，下端正好指向南天极。

The upper end of the sundial points right to the North Pole ， and the lower end to the South .

所以在观察日晷时，首先要了解两个不同时期晷针的投影位置。

Therefore ， when observing the sun-dial ， it is important to first find out the projection position in the two different peri-ods .

从秋分到春分期间，太阳在天赤道的南侧运行，因此，晷针的影子投向晷面的下方。

Likewise ， since the sun moves in the southern side of the equator from the autumn equinox to the vernal e-quinox , the shadow is cast on the lower part .

铜制的指针叫做“晷针”，垂直地穿过圆盘中心，起着圭表中立竿的作用，因此，晷针又叫“表”，石制的圆盘叫做“晷面”，安放在石台上，呈南高北低，

The needle crosses the center of the dial vertically ， just like the pole of the gnomon ， and the stone dial is placed onto a stone plat-form ， higher in the south and lower in the north .