2021年05月25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, people living from southeast Asia, across the Pacific, to the southwest Americas may get to see a Blood Supermoon Total Lunar Eclipse. Here the term blood refers to the (likely) red color of the fully eclipsed Moon, while the term supermoon indicates the Moon’s slightly high angular size — due to being relatively close to the Earth in its slightly elliptical orbit.

Details: Total Lunar Eclipse on 2021 May 26

Tomorrow’s picture: open space


月全食期间的月亮
影片提供:
Wang Letian (王乐天) & Zhang Jiajie (章佳杰)

说明: 在月全食期间,月亮的外观有何变化?这部缩时主题影片特别经过数位处理,让月亮在2018年1月31日5小时月食期间,保持明亮和置中。在影片开头时,可见到一轮满月,因为只有满月会发生月食。在此同时,背景的恒星也在流转,这是由于在月食期间,月亮仍持续绕行地球。接着就会见到地球的圆影掠过月盘。其中,圆影边缘的淡蓝色泽,源自穿过地球高层蓝天的阳光,而圆影中心的暗红色泽,其成因则和造成地平线附近的红日之机制雷同。在明天,位在东南亚、太平洋到西南美洲一带的住民,将见到血红的超级满月全食。其中,血红是指全食月的暗红色泽,而超级月亮是指这个轮明月稍平常的满月,因为在椭围的轨道上,它位在较靠近地球的位置。

详细信息: 2021年5月26日的月全食

明日的图片: open space

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