赤道式日晷，是古人利用太阳投影测时的科学仪器，由晷盘、晷针和底座组成。
An equatorial sundial is an ancient scientific equipment to tell time by using the shadow from solar projection. It consists of a sundial plate, a gnomon and a base.
日晷的主要部件是由一根晷针和刻有刻线的晷面组成，随着太阳在天空运行，晷针的投影像钟表指针一样在晷面上移动，就可以指示时辰。
The main parts of a sundial are an erect stylus and a calibrated disk. As the sun moves in the sky, the shadow of the stylus moves like a clock hand around the disk indicating the hours.
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 sundial, it is important to first find out the projection position in the two different periods.
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 sundial, it is important to first find out the projection position in the two different periods.
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