In the midst of his preoccupations, he perceived, from a shadow cast by the sun, that some one had halted on the crest of the slope immediately behind him.
他正在这样思前想后，忽然看见太阳把刚刚来到斜坡顶上紧挨着他背后的一个人的影子投射在他的眼前。
Togeth-er with Nan Gongshuo, he used a post to measure the shadow cast by the sun, and calculated the relations between the sun's positions and the solar terms.
张遂和南宫说等人一起，用标竿测量日影，推算出太阳位置与节气的关系。
The eclipse, caused by the direct alignment of the moon in front of the sun, cast a silver shadow over Accra and left many residents clapping and cheering.
这次日食，由于月球在太阳前面的直线方向上而引起，在阿卡拉撒下了银色的阴影并且让很多居民鼓掌欢呼。
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