天色渐晚,不知道答案的要不要拿张纸试一下? 前三个选项前半夜都能看到,D要后半夜了
- 转发 @EasyNight : 今晚没有特别值得观看的天象,但是有个小实验可以实地操作。拿一张A4纸,伸直手臂后,用单眼观测,它差不多正好挡住哪个天体组合呢? #每日天文一题
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