When Venus begins to cross the Sun's disc, it looks smeared not circular—which makes it difficult to establish timings.
当金星开始穿过太阳的圆盘时，它看起来有斑点，不是圆形的——这使得确定时间变得困难。
When Venus begins to cross the Sun's disc, it looks smeared not circular—which makes it difficult to establish timings.
当金星开始穿过太阳的圆盘时，它看起来有斑点，不是圆形的——这使得确定时间变得困难。
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