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20%  
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  • APOD: Lunations (09/12/18)

    09/28/2018 9:56:51 AM PDT · by zeugma · 5 replies
    Astronomy Picture of the Day ^ | 9/12/18 | NASA's Scientific Visualization Studio;
    Our 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 taken by NASA's Moon-orbiting Lunar Reconnaissance Orbiter to show all 12 lunations that appear this year, 2018. 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...