从冬至到夏至的延时日轨图
2019 December 21 Solstice to Solstice Solargraph Timelapse Image Credit & Copyright: Sam Cornwell Explanation: The 2019 December Solstice, on the first day of winter in planet Earth’s northern hemisphere and summer in the south, is at 4:19 Universal Time December 22. That’s December 21 for North America, though. Celebrate with a timelapse ani...