2026年3月1日
The Moon During a Total Lunar Eclipse
Video Credit: Wang Letian & Zhang Jiajie
Explanation: How does the Moon’s appearance change during a total lunar eclipse? The featured time-lapse video was digitally processed to keep the Moon bright and centered during the 5-hour eclipse of 2018 January 31. At first the full moon is visible because only a full moon can undergo a lunar eclipse. Stars move by in the background because the Moon orbits the Earth during the eclipse. The circular shadow of the Earth is then seen moving across the Moon. The light blue hue of the shadow’s edge is related to why Earth’s sky is blue, while the deep red hue of the shadow‘s center is related to why the Sun appears red when near the horizon. Tomorrow night, people living in Eastern Asia, Australia, and much of North America may get to see a Total Blood Moon Lunar Eclipse. Here the term blood refers to the (likely) red color of a fully eclipsed Moon.
Almost Hyperspace: Random APOD Generator
Tomorrow’s picture: Orion’s dust
月全食期间的月球
影像提供与版权: Wang Letian & Zhang Jiajie
解说: 在一次月全食期间，月球的外观会如何变化？这段精选缩时影片经数位处理，让月球在2018年1月31日这场为时5小时的月全食期间始终明亮且置中。起初，可以看到满月，因为只有满月才可能发生月食。背景中的恒星会缓缓移动，因为在月食期间，月球会绕着地球运行。随后，可以看到地球的圆形阴影在月球上移动。阴影边缘常见的淡蓝色，与为何地球天空呈蓝色的机制相关，而阴影中心所呈现的深红色，则与为何太阳在接近地平时会偏红的原因有关。明天晚上，居住在东亚、澳洲，以及北美洲大部分地区的民众，有望看见一次「血月」月全食。这里所说的「血」一词，是指月全食食甚时，月亮可能呈现的红色。
几乎是超空间: 随机每日天文图（APOD）产生器
明日的图片: Orion’s dust
