9月日出时分的光和影

2022年9月24日

September Sunrise Shadows
Image Credit & Copyright: Donato Lioce

Explanation: The defining astronomical moment for this September’s equinox was on Friday, September 23, 2022 at 01:03 UTC, when the Sun crossed the celestial equator moving south in its yearly journey through planet Earth’s sky. That marked the beginning of fall for our fair planet in the northern hemisphere and spring in the southern hemisphere, when day and night are nearly equal around the globe. Of course, if you celebrate the astronomical change of seasons by watching a sunrise you can also look for crepuscular rays. The shadows cast by clouds can have a dramatic appearance in the twilight sky during any sunrise or sunset. Due to perspective, the parallel shadows will seem to point back to the rising Sun and a place due east on your horizon near the equinox date. Taken on September 15, this sunrise sea and skyscape captured crepuscular rays in the sky and watery specular reflections from the Mediterranean coast near the village of Petacciato, Italy.

Tomorrow’s picture: shadows of cosmic dust

9月日出时分的光和影
影像提供与版权: Donato Lioce

说明: 以天文学的观点来说，今年9月的秋分在2022年9月23日（星期五）01:03 UTC降临，当时的太阳在它每年于地球天空的旅程中，向南移动正好穿过天球赤道。这个事件标记了地球北半球的秋天和南半球春天的起点，而全球各地的白昼和黑夜几乎等长。当然，如果你是透过观看日出来庆祝天文学的季节变化，你不妨也看看云隙光。在任何日出或日落时分，云投射的影子在暮曙光天空中，通常带有很戏剧性的外观。由于透视之故，平行的影子似乎回指初升的太阳，以及春秋分附近地平线正东的那点。这幅摄于9月15日的日出时分海洋与天空景观，记录了天空中的云隙光及意大利Petacciato村附近地中海沿岸水面的反映。

明日的图片: shadows of cosmic dust