秋分：从冬至到夏至的太阳
2019 September 23 Equinox: The Sun from Solstice to Solstice Image Credit & Copyright: Tunç Tezel (TWAN) Explanation: Today is an equinox, a date when day and night are equal. Tomorrow, and every day until the next equinox, the night will be longer than the day in Earth’s northern hemisphe […]