For example, intercepting the weather forecast of a certain day in Yantai and completing 1 ~ E accordingly. The position and moving direction of the sun's direct point on that day is () a.

Today, the sunrise time is 4: 10, the sunset time is 1x: 98, and the day length is = sunset time-sunrise time = 1 1 hour 88 minutes; Tomorrow sunrise time is 4: 09, sunset time 1x: 99, day length = sunset time-sunrise time = 1 1 hour 90 minutes. The length of these two days is less than 18 hours, the sun shines directly in the southern hemisphere, the length of the day increases, and the direct point of the sun moves northward.

So choose: 4.