In the United States and the north temperate zones generally, autumn begins on approximately September 21 of every year. Astronomically, the start of the third season of the year, which comes between summer and winter, can be pinpointed precisely. The ecliptic, the plane in which the Sun appears to revolve about the Earth and in which the Earth actually revolves about the Sun, is divided into four 90-degree sections. Each of these sections commences with a specific point: two equinoxes and two... więcej
Salem Press Encyclopedia, 2020. 1p.