希腊神庙外的新月
(原标题: Crescent Moon Beyond Greek Temple)
2023-02-28
浏览次数: 14
为什么离地平线很远的地方永远看不到细细的新月？因为只有当月亮在天空中离太阳很近的时候，才会出现月牙形的月相。月牙并不是由地球的阴影造成的，而是由于看到月球的一小部分直接被太阳照亮。此外，新月最厚的部分总是出现在太阳的方向上。晚上，一轮薄薄的新月会在太阳落下后不久落下，整个晚上都看不见。或者，在早上，新月会在太阳升起之前不久升起，而之前的大部分夜晚都看不到新月。这张照片摄于两周前，日出前的地平线附近，距离希腊古代波塞冬神庙的遗迹很远。
查看原文解释
Why is a thin crescent moon never seen far from a horizon? Because the only geometry that gives a thin crescent lunar phase occurs when the Moon appears close to the Sun in the sky. The crescent is not caused by the shadow of the Earth, but by seeing only a small part of the Moon directly illuminated by the Sun. Moreover, the thickest part of the crescent always occurs in the direction of the Sun. In the evening, a thin crescent Moon will set shortly after the Sun and not be seen for the rest of the night. Alternatively, in the morning, a crescent Moon will rise shortly before the Sun after not being seen for most of the night. Pictured two weeks ago, a crescent moon was captured near the horizon, just before sunrise, far behind remnants of the ancient Temple of Poseidon in Greece.
© Elias Chasiotis