托勒密绘制了48个星座中1000多颗星的星图。

Ptolemy charted more than 1,000 stars in 48 constellations.

《柯林斯英汉双解大词典》

但是，如果同时有多颗星存在怎么办？

But what if we view more than one star at a time?

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迄今为止所发现的454颗系外行星中，多颗都具有极近椭圆形的轨道，这意味着行星与它们的母星并不总保持相同距离。

Many of the 454 exoplanets discovered to date have highly elliptical orbits, meaning the planets are not always the same distance from their parent star.

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