Schematic diagram of bisection of side view and top view of the North and South Pole sun

Side view of the sun bisector: an interpretation of the "sun bisector" in the vertical semi-earth revolution diagram of the terminator line.

Formula: "Left oblique left winter, right oblique right winter".

That is, in the earth revolution map, if the earth axis is tilted to the left, the winter solstice is on the left; If the earth's axis is tilted to the right, the winter solstice will be on the right. As long as we judge the winter solstice, we can judge the vernal equinox, summer solstice and autumn equinox according to the direction of the earth's revolution. * In the top view of the earth, the earth rotates counterclockwise, and the viewing hemisphere is the northern hemisphere; When the earth rotates clockwise, the hemisphere you see is the southern hemisphere.