6月21日，夏至：我们迎来了一年中白昼最长，黑夜最短的日子！ 这一天，哈尔滨昼长15小时43分，上海昼长14小时11分，广州昼长13小时34分。 这一天，北京凌晨2：42天就开始蒙蒙亮，4：45日出，19：46日落，21：49才完全天黑。 白昼这么长，黑夜这么短，这漫漫白昼怎...
On June 21, the summer solstice: we celebrated the day of the year, the longest night of the shortest day! On this day, Harbin days and 15 hours and 43 minutes long, Shanghai day 14 hours, 11 minutes long, guangzhou daylength 13 hours, 34 minutes. On this day, Beijing 2:42 day began there in the morning, when the sunrise, 19:46 sunset, 21:49 was completely dark. The day is so long, the night is so short, how long the day it then...
