Category:Season

The changing of the seasons is marked in most lands by a cycle of ever earlier sunrises and ever later sunsets beginning immediately after the winter solstice and ending with the summer solstice, and a cycle of ever later sunrises and ever earlier sunsets beginning immediately after the summer solstice and ending with the winter solstice. The summer solstice then has the shortest night and the longest day, and the winter solstice has the longest night and the shortest day. Summer is often held to begin at the summer solstice, and winter correspondingly at the winter solstice. Each is often held to end at the equinox, when the length of the day and the night are equal. Thus spring equinox marks the end of winter and the beginning of spring, and the autumn equinox marks the end of summer and the beginning of autumn.

This is to say that the

progressive lengthening and progressive shorting of the length of the day and night, which is to