A simple method to predict lunar eclipses proposed in this article uses the position of the full moon relative to the sun. Calculations show that the method works better during the summer period in Scandinavia simply because the night is shorter and therefore the moon is closer to the exact time of the lunar eclipse when the moon rises as the sun is setting. When the conditions are right, the moon reflects the red colour of the setting sun. The two celestial bodies look within a short time as similar objects, like twins or ‘Twin Sun’ (TS). This article aims to demonstrate that TS is a useful method to predict lunar eclipses during the summer period at Northern latitudes. It will be discussed that TS as a lunar eclipse predictor could partly explain the alignment of some megalithic monuments in Denmark constructed from c. 3300-3100 BC. Finally, it is suggested that TS could be an explanation behind the doubleness reflected in the construction of the Danish passage graves. Some archaeological finds seemingly also render the TS phenomenon.

中文翻译：

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“双太阳”：一个简单的月食预测器

本文提出的一种预测月食的简单方法是使用满月相对于太阳的位置。计算表明，该方法在斯堪的纳维亚夏季期间效果更好，因为夜晚较短，因此当太阳落山时月亮升起时，月亮更接近月食的确切时间。当条件合适时，月亮会反射出落日的红色。这两个天体在很短的时间内看起来就像双胞胎或“双太阳”（TS）一样。本文旨在证明 TS 是一种有用的方法来预测北纬夏季期间的月食。将讨论作为月食预测器的 TS 可以部分解释丹麦的一些巨石纪念碑的排列，这些纪念碑由 c. 公元前 3300-3100 年。最后，有人认为 TS 可能是丹麦通道墓地建造所反映的双重性背后的解释。一些考古发现似乎也渲染了TS现象。