Equinox日落
(原标题: Equinox Sunset)
2025-09-21
浏览次数: 1497
太阳每天都朝着同一个方向落下吗？不，日落的方向取决于一年中的时间。虽然太阳总是大致朝向西方落下，但在像明天这样的春分日，太阳会直接朝向西方落下。在明天的9月春分之后，太阳将越来越偏向西南方向，在12月至日达到最大位移。在明天的9月春分之前，太阳已经向西北方向落下，在6月至日达到最大位移。这张特色的延时图像显示了从2019年12月到2020年6月，每个月有一天日落的七个波段。这些图像序列拍摄于加拿大阿尔伯塔省，位于地球赤道以北，埃德蒙顿市位于前景。中间的带子显示的是三月春分时的日落。从这个位置，明天太阳将再次沿着同样的春分带落下。
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Does the Sun set in the same direction every day? No, the direction of sunset depends on the time of the year. Although the Sun always sets approximately toward the west, on an equinox like tomorrow the Sun sets directly toward the west. After tomorrow's September equinox, the Sun will set increasingly toward the southwest, reaching its maximum displacement at the December solstice. Before tomorrow's September equinox, the Sun had set toward the northwest, reaching its maximum displacement at the June solstice. The featured time-lapse image shows seven bands of the Sun setting one day each month from 2019 December through 2020 June. These image sequences were taken from Alberta, Canada -- well north of the Earth's equator -- and feature the city of Edmonton in the foreground. The middle band shows the Sun setting during an equinox -- in March. From this location, the Sun will set along this same equinox band again tomorrow.