《徐霞客游记·粤西游日记三十九》
到此地龙眼树没有了。二十四日早晨起床，阴云四面合拢，这天是立夏日。
二十四日晨起，阴云四合，是日为立夏。
There are no longan trees here. I got up on the morning of the 24th, when dark clouds gathered around. This is the first day of summer.