一年份的日出

2022年1月5日

A Year of Sunrises
Image Credit & Copyright: Luca Vanzella

Explanation: Does the Sun always rise in the same direction? No. As the months change, the direction toward the rising Sun changes, too. The featured image shows the direction of sunrise every month during 2021 as seen from the city of Edmonton, Alberta, Canada. The camera in the image is always facing due east, with north toward the left and south toward the right. As shown in an accompanying video, the top image was taken in 2020 December, while the bottom image was captured in 2021 December, making 13 images in total. Although the Sun always rises in the east in general, it rises furthest to the south of east on the December solstice, and furthest north of east on the June solstice. In many countries, the December Solstice is considered an official change in season: for example the first day of winter in the North. Solar heating and stored energy in the Earth’s surface and atmosphere are near their lowest during winter, making the winter season the coldest of the year.

Status Updates: Deploying the James Webb Space Telescope

Tomorrow’s picture: evening to morning

一年份的日出
影像提供与版权: Luca Vanzella

说明: 太阳都在相同的方位升起吗？并不是；随着月份演替，日出的方位也会有变化。这幅在2021年摄于加拿大·亚伯达省·埃德蒙顿市的主题影像，呈现从当地看出去每月的日出方位之变化。摄影相机的指向皆是正东，所以影像的左侧是北方，右侧为南方。如同附随的影片所示，最顶端的影像是摄于2020年12月，而最下方的则是摄于2021年12月，所以这幅影像总共是由13张照片所组成。虽然太阳都是从东方升起，不过冬至那天的日出在东南，而夏至那天的日出最偏北。有许多国家认为冬至标志了季节变化的起点，是北半球冬季的第一天。在冬季，阳光及储存在地面的热能，是一年之中接近最少的时候，所以气温通常也是一年之中最低。

状态更新: 正在部署的詹姆·斯韦伯太空望远镜

明日的图片: evening to morning