保护地球，探索宇宙，发现文明
2021年06月20日 Sunrise Solstice over Stonehenge Image Credit & Copyright: Max Alexander, STFC, SPL Explanation: Today the Sun reaches its northernmost point in planet Earth’s sky. Called a solstice, many cultures mark this date as a change of seasons — from spring to summer in Earth’s Northern Hemisphere and from fall to winter in Earth&#...
2021年06月19日 Northern Summer Twilight Image Credit & Copyright: Justin Anderson Explanation: Nights grow shorter and days grow longer as the summer solstice approaches in the north. Usually seen at high latitudes in summer months, noctilucent or night shining clouds begin to make their appearance. Drifting near the edge of space about 80 kilometers above...
2020 June 20 Northern Summer on Titan Image Credit: Cassini Imaging Team, SSI, JPL, ESA, NASA Explanation: Today’s solstice brings summer to planet Earth’s northern hemisphere. But the northern summer solstice arrived for ringed planet Saturn over three years ago on May 24, 2017. Orbiting the gas giant, Saturn’s moon Titan experiences the S...
2019 December 22 Solstice Illuminated: A Year of Sky Video Credit & Copyright: Ken Murphy (MurphLab); Music: Ariel (Moby) Explanation: Can you find which day is the winter solstice? Each panel shows one day. With 360 movie panels, the sky over (almost) an entire year is shown in time lapse format as recorded by a video camera on the roof of the Explorato...
2019 September 28 An Analemma of the Sun Image Credit & Copyright: Gyorgy Soponyai Explanation: This week the equinox found the Sun near the middle, but not at the crossing point, of an analemma in its annual trek through planet Earth’s skies. In this scenic view, that graceful, figure-8-shaped curve was intentionally posed above the iconic Danube...
2019 June 28 巴黎的夏至夜 影像来源及版权: Michel Loic 说明：6月21日的夜晚是地球北纬地区时长最短的夜晚，因此位于北纬48.9度的巴黎也不例外。尽管如此，这座光明之城仍然异常明亮。在夏至日落后，天空中布满了银色的夜光云。流星尘或火山灰上的冰冷凝结物悬浮在太空边缘，它们位于中气层最大高度、强烈的阳光下。在夏季的高纬度地区，我们可以看到引人注目且广泛分布的北方夜光云。 A Solstice Night in Paris Image Credit & Copyright: Loic Michel Explanation: The night of June 21 was the shortest night for planet Earth’s northern lat...
2019 June 27 时长越来越长的白昼 影像来源及版权: Gianluca Belgrado 说明：这幅持续拍摄六个月的长曝光影像将从冬至到夏至（2018年12月21日至2019年6月16日）的时间压缩成一个单一的视角。这幅不寻常的影像被称为日轨图，它是由一台高大的管状针孔相机、通过使用一张照相纸拍摄而成。这台简易的相机被固定在意大利.卡萨拉诺的一个单一地点上，并连续不断地记录太阳的日常路径，就像一道炽热的轨迹在感光纸上燃烧一样。这些轨迹上的中断和缺口是由云层造成的。在曝光结束时，我们对纸张进行扫描从而构建出这幅数字影像。当然，从12月开始，太阳轨迹会在临近北半球冬至时落在天空中的较低处。随着白昼时长的增加和6月21日夏至的来临，太阳轨迹会越升越高。 The Longer Days Image Credi...
2019 June 21 落日时分的日行迹 影像来源及版权: Marcella Giulia Pace 说明：今天世界时间15点54分夏至来临之时，太阳在其每年穿过地球天空的旅程中会到达赤纬最北的位置。在天文学上，夏至标志着北半球夏季和南半球冬季的开始。今天也是北半球日出到日落之间白昼最长的一天。实际上，夏至的太阳位于这幅合成影像的顶部附近，也就是由太阳位置绘制的日行迹或8字曲线最北点。这道日行迹是由从2018年6月21日到2019年6月7日，每十天在同一时间拍摄的影像构建而成。拍摄时间被选择为一年中日落时间最早的冬至附近，因此日行迹的最低点正好与影像左侧一览无余的海平面相接。沿地平线向右（北）分布的落日以秋分的落日为中心，以夏至的落日结束点。 Sunset Analemma Image Credit &...