Diurnal changes of the northern and southern hemispheres at vernal equinox, summer solstice, autumn equinox and winter solstice.

Summer solstice: the days in the northern hemisphere are long and the nights are short. The farther north the days are, the more extreme days appear in the Arctic Circle and its north. In the southern hemisphere, the days get shorter, the nights get longer, and the days get shorter farther south, and polar nights appear in the Antarctic circle and its south; The equator is as long as day and night.

Winter solstice: the days in the northern hemisphere are shorter and the nights are longer, and the days are shorter as you go north, and the polar nights appear in the Arctic Circle and its north; The days in the southern hemisphere are long, and the nights are short. The days are longer as you go south, and there are polar days in the Antarctic circle and its south. The equator is as long as day and night.

Equinox and autumnal equinox: The global day and night are equal in length.