Passage: The sun lights only one side of the earth. It is the turning of the earth that gives us day and night. Because it turns toward the east, the sun seems to rise in the east. Throughout the day, the sun appears to move westward across the sky because we ourselves are moving eastward. It disappears or sets in the west when the turning earth blots it out of our view. It might seem that the sun always rises in the east and sets in the west, but it is not true. In winter (north of the Equator) it rises and sets far to the north. On only two days in the year the sun rises exactly in the east and sets exactly in the west. These days are about March 21 and September 23. This is true everywhere in the world except near the poles. According to the passage, during the year the sun ........… .