观察上升和下降的星对是一个很好的技巧。
Looking at rising and setting star pairs is a good technique.
星对人说过一次。
泰坦星对卡西尼号牵引力的细微变化表明,该星球内部为冰和岩石的混合物,且没有明晰的岩石分界线。
Subtle differences in Titan's pull on Cassini suggest that the materials inside the moon are a mix of ice and rock with no clearly defined rocky layers.
He was fascinated with astrolabes and was interested in sailing.
他着迷于星盘,并对航海很感兴趣
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