2022年2月1日

Moon Phases 2022
Video Credit:
Data: Lunar Reconnaissance Orbiter ; Animation: NASA’s Scientific Visualization Studio;
Music: Build the Future (Universal Production Music), Alexander Hitchens

Explanation: What will the Moon phase be on your birthday this year? It is hard to predict because the Moon’s appearance changes nightly. As the Moon orbits the Earth, the half illuminated by the Sun first becomes increasingly visible, then decreasingly visible. The featured video animates images and altitude data taken by NASA’s Moon-orbiting Lunar Reconnaissance Orbiter to show all 12 lunations that appear this year, 2022 — as seen from Earth’s northern (southern) hemisphere. A single lunation describes one full cycle of our Moon, including all of its phases. A full lunation takes about 29.5 days, just under a month (moon-th). As each lunation progresses, sunlight reflects from the Moon at different angles, and so illuminates different features differently. During all of this, of course, the Moon always keeps the same face toward the Earth. What is less apparent night-to-night is that the Moon’s apparent size changes slightly, and that a slight wobble called a libration occurs as the Moon progresses along its elliptical orbit.

Tomorrow’s picture: galaxy center in radio detail


2022年的月相
影片提供:
数据提供: Lunar Reconnaissance Orbiter ; 动画: NASA’s Scientific Visualization Studio;
配乐: Build the Future (Universal Production Music), Alexander Hitchens

说明: 今年你生日那天的月相是什么?要预测有点难度,因为月亮的外观每晚都不同。随着月亮绕行地球,月亮被太阳照亮的半球,可见的区域会缓缓增加,接着再慢慢减少。这部呈现2022年全部12个月相周期的主题动画影片,所使用的影像来自美国航太总署的月球探勘号轨道船。为期约29.5天(略短于一个月)的月相周期,包含了所有的月亮位相变化。随着月相周期演历,阳光从月表反射的角度也随之改变,导致照亮的月表特征也不同。在出现这些变化的同时,月亮一直以相同的一面朝着地球。从前一夜到下一夜的变化之中,较难分辨的是月亮的视大小也稍有改变,而且随着月亮沿椭圆轨道运行,也会出现名为天平动的微小摇晃。

明日的图片: galaxy center in radio detail

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