2022年月相
(原标题: Moon Phases 2022)
2022-02-01
浏览次数: 21
今年你生日那天的月相是什么？这很难预测，因为月亮的外观每晚都在变化。当月球绕地球公转时，被太阳照亮的那一半首先变得越来越可见，然后变得越来越不可见。这段特色视频将美国宇航局绕月月球侦察轨道器拍摄的图像和高度数据动画化，展示了从地球北半球（南半球）看到的2022年出现的所有12个月。一个月是指一个完整的月亮周期，包括它所有的相位。满月大约需要29.5天，不到一个月（月）。随着每个月的变化，太阳光从月球上以不同的角度反射，因此照亮了不同的特征。当然，在所有这些过程中，月球总是保持同一张脸对着地球。每晚不太明显的是，月球的表观大小会发生轻微的变化，当月球沿着其椭圆轨道运行时，会发生轻微的摆动，称为“振动”。
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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.