一年份的日落
2024年12月21日
A Year in Sunsets
Image Credit & Copyright: Wael Omar
Explanation: A year in sunsets, from April 2023 to March 2024, track along the western horizon in these stacked panoramic views. The well-planed sequence is constructed of images recorded near the 21st day of the indicated month from the same location overlooking Cairo, Egypt. But for any location on planet Earth the yearly extreme northern (picture right) and southern limits of the setting Sun mark the solstice days. The word solstice is from Latin for “Sun” and “stand still”. On the solstice date the seasonal drift of the Sun’s daily path through the sky appears to pause and reverse direction in its annual celestial journey. Of course the Sun reaches a stand still on today’s date. The 21 December 2024 solstice at 09:21 UTC is the moment of the Sun’s southernmost declination, the start of astronomical winter in the north and summer in the south.
Tomorrow’s picture: just local fluff
说明: 这张堆叠的全景影像，呈现了从2023年4月到2024年3月，西方地平线的日落位置在一年之中的变化。这项精心规划的序列影像工作，从同一位置俯瞰埃及的开罗并摄于每月的21日附近。不过，在地球上的任何地方，每年日落的最北点（照片右侧）与最南点，皆标记了夏至和冬至的位置。在拉丁语里，“至日”（solstice）意指“太阳”（Sol）和“静止”。在至日这天，太阳于天空中每天的日轨之年度天球旅程，看似伫停并开始反向。想当然耳，今天的太阳正好位于至点。2024年12月21日的冬至在世界时09:21 UTC降临，此刻标志了太阳在赤纬上的最南点，并为北半球的天文冬季和南半球的天文夏季拉开序幕。
明日的图片: just local fluff
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