三条日轨 – NASA中文

2023年6月21日

Three Sun Paths
Image Credit & Copyright: Marcella Giulia Pace & Giuseppe De Donà

Explanation: Does the Sun follow the same path every day? No. The Sun’s path changes during the year, tracing a longer route during the summer than the winter. Pictured here, the Sun’s arc was captured from noon to sunset on three days, from highest in the sky to lowest: summer solstice, equinox, and winter solstice. The images were taken near Gatto Corvino Village in Sicily, Italy in 2020 and 2021. The path and time the Sun spends in the sky is more important in determining the season than how close the Earth is to the Sun. In fact, the Earth is closest to the Sun in January, during northern winter. Today is a solstice, so today the Sun is taking its longest path of the year across the sky in Earth’s northern hemisphere, but the shortest path in the southern hemisphere.

Tomorrow’s picture: open space

三条日轨
影像提供与版权: Marcella Giulia Pace & Giuseppe De Donà

说明: 太阳每天都沿相同的路径东升西落吗？答案是：不会。一年之中，每天的日轨都有变化，而且夏季的日轨长度比冬季长。在这幅影像里，这3道记录太阳从中午到日落行踪的日轨弧，从高到低分别是：夏至、春秋分和冬至这三天。组成这幅影像的照片，则是在2020年及2021年摄于意大利西西里岛的加托科尔维诺村附近。在季节的决定上，太阳在天空的日轨长度和滞空的时间，比地球与太阳的距离重要。事实上，在一月的北半球冬季之时，地球最靠近太阳。今天又逢至点，所以太阳今天在北半球的天空中，所走的是一年中最长的夏至路径，不过在南半球，它所循的却是最短的冬至日轨。