這些光點是什么？太陽的軌跡？

Does the Sun return to the same spot on the sky every day? No. A better and more visual answer to that question is an analemma, a composite of images taken at the same time and from the same place over the course of a year. The featured analemma was compiled at 4:30 pm many afternoons from Taiwan during 2021, with the city skyline of Taipei in the foreground, including tall Taipei 101. The Sun’s location in December — at the December solstice — is shown on the far left, while its location at the June solstice is captured on the far right. Also shown are the positions of the Sun throughout the rest of the day on the solstices and equinoxes. Today is the June solstice of 2022, the day in Earth’s northern hemisphere when the Sun spends the longest time in the sky. In many countries, today marks the official beginning of a new season, for example winter in Earth’s southern hemisphere.

太陽每天都會回到天空的同一點嗎？不會。此問題較好也較直觀的答案為日行跡，一種在一年之中，從同時間同地點所拍攝的太陽影像之組合圖。上面這張日行跡主題影像，是由攝于臺灣下午4點的多幅2021年照片所組成，影像前景為包括臺北101大樓在內(nèi)的臺北市天際線。其中，十二月冬至的太陽在最左側(cè)，六月夏至的太陽在最右側(cè)。此外，影像也呈現(xiàn)春分、秋分、夏至、及冬至當(dāng)天的太陽跡線。今天是2022年的夏至，也是地球的北半球日照時間最長的一天。在許多國家，今天也標(biāo)記了新季節(jié)的起點，例如在南半球，今天是冬季的第一天。