Geography in senior high school: What is the apparent motion of the sun in Hainan Island from summer to morning?

At 6 o'clock local time, due east is on the vernal equinox. When the direct point of the sun is between Hainan Island and the equator, Hainan Island will have due east and due west moments. In summer solstice, there is no due east moment in Hainan Island. The apparent motion of the sun rises in the northeast, due north at noon and sets in the northwest. As shown in the figure.

The reason is the same as the area north of the Tropic of Cancer, which rises in the southeast from winter solstice, falls in the south at noon and in the southwest. There is no time when the west is the east.

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