土星春分
(原标题: Equinox at Saturn)
2025-09-22
浏览次数: 1498
在土星上，光环告诉你季节。在地球上，今天标志着春分，这是地球赤道直接向太阳倾斜的时间。由于土星的大环沿着行星的赤道轨道运行，当土星的自转轴指向太阳时，这些环从太阳的方向来看是最突出的。相反，当土星的自转轴指向侧面时，就会出现春分，而且不仅从太阳上，从地球上也很难看到边缘上的环。在这幅特色蒙太奇中，土星在2020年到2025年之间的图像被叠加在一起，以显示这颗巨大的行星在今年的春分时从北方的夏天到南方的夏天。昨天，土星碰巧离地球最近，所以这个月这个带环的巨人的球体相对明亮，整个晚上都可以看到。
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On Saturn, the rings tell you the season. On Earth, today marks an equinox, the time when the Earth's equator tilts directly toward the Sun. Since Saturn's grand rings orbit along the planet's equator, these rings appear most prominent -- from the direction of the Sun -- when the spin axis of Saturn points toward the Sun. Conversely, when Saturn's spin axis points to the side, an equinox occurs, and the edge-on rings are hard to see from not only the Sun -- but Earth. In the featured montage, images of Saturn between the years of 2020 and 2025 have been superposed to show the giant planet passing, with this year's equinox, from summer in the north to summer in the south. Yesterday, Saturn was coincidently about as close as it gets to planet Earth, and so this month the ringed giant's orb is relatively bright and visible throughout the night.
© Imran Sultan