seasons

天文·每日一图

土星的春分

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The planet Saturn is pictured 6 times in a horizonal column, labelled by years with 2020 at the top and 2025 at the bottom. As the years progress, Saturn’s ring appear less prominent. Please see the explanation for more detailed information.
这张图以水平列方式展示了土星在六个不同年份的影像，从上到下依次标注为2020年至2025年。随着年份推移，土星的光环逐渐变得不那么显眼。有关更多详细信息，请参阅说明。

天文·每日一图

土星环消失之谜

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The planet Saturn is shown many times down the composite image. The top image was taken in 2020 and shows Saturn’s rings very clearly, whereas the bottom image was taken in 2025 and the rings are only visible as a dark line across the planet. The six images show the progression year by year. Please see the explanation for more detailed information.
土星在合成图像中多次出现。上方图像拍摄于2020年，清晰地展现了土星环；下方图像拍摄于2025年，土星环仅以一条暗线的形式横跨整个土星。这六幅图像展现了土星环逐年变化的轨迹。有关更多详细信息，请参阅说明。

天文·每日一图

秋分: 卡拉尼什巨石阵上空的日行迹

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2022年9月18日 Analemma over the Callanish Stones Image Credit & Copyright: Giuseppe Petricca Explanation: If you went outside at the same time every day and took a picture that included the Sun, how would the Sun’s position change? A more visual answer to that question is an analemma, a comp

天文·每日一图

土星环与土星的季节

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2021年9月19日 Rings and Seasons of Saturn Image Credit & Copyright: Damian Peach/SEN Explanation: On Saturn, the rings tell you the season. On Earth, Wednesday marks an equinox, the time when the Earth’s equator tilts directly toward the Sun. Since Saturn’s grand rings orbit along the

天文·每日一图

近日点与远日点

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2021年7月8日 Perihelion to Aphelion Image Credit & Copyright: Richard Jaworski Explanation: Aphelion for 2021 occurred on July 5th. That’s the point in Earth’s elliptical orbit when it is farthest from the Sun. Of course, the distance from the Sun doesn’t determine the seasons. T

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