Simple geographical problems. The exam is coming!

International date line is the time line and the international international date line (near meridian 180).

The latter is fixed, find the zero line for 90 W.

When the direct point of the sun is located on the meridian, it is 12, and the zero point is the meridian opposite to it, that is, 90 e.

90 E and 180 divide the earth into two days.

China to Ridong dam area.

120 E is between 90 E and 180, that is to say, it is June 22, accounting for a quarter of the whole earth.

Crossing the international international date line eastward (near 180), the daily cycle is one day, that is, June 2 1, accounting for three quarters.

2 1 Compared with 22nd, 22nd is a new day, and 2 1 is an old day.

Specific scope:

June 22, east of 90 E and west of 180.

June 2 1, west of 90 E, east of 180.

Personally, I think the process is very detailed, and I will leave the rest to you.