Ptolemy charted more than 1000 stars in 48 constella-tions.
托勒密绘制了48个星座1,000多颗恒星的星位图。
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Ptolemy's model of the universe with the Earth at the center.
托勒枚的以地球为中心的宇宙模型.
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Is the most famous astronomer Ptolemy.
最为著名的天文学家是托勒密.
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The really important thing about Ptolemy's map was that north was at the top.
托勒密所绘制的地图有一点是十分重要的,那就是他把北方置于地图的上方.
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