Solar illumination in the spring and autumn equinox, winter and summer solstice in the northern and southern hemispheres

The photo of the sun can be divided into two parts: side view and top view, as well as north and south poles.

In the side view, the termination line is a straight line, tangent to the South Arctic Circle and passing through the center point. It is extremely day in the North Pole and extremely night in the South Pole.

In the top view, the termination line is a curve tangent to the polar circle, and the two intersections with the equator should bisect the equator. If you look down at the North Pole, it should be daytime in the Arctic Circle; Looking down from the South Pole, it is night in the Antarctic circle.

The picture seen in the North Pole: A circle is regarded as the equator, a small circle is drawn as the tropic of cancer, and a small circle is regarded as the Arctic Circle, and there will be extreme days in the Arctic Circle.

The picture seen in the Antarctic: a circle as the equator, a small circle as the tropic of Capricorn, and a small circle as the Antarctic circle, the polar night of the Antarctic circle.

Side view:

Left: Summer solstice chart in the northern hemisphere.

Right: winter solstice map of the northern hemisphere.

Middle picture: summer solstice chart in the southern hemisphere.