The sun crosses the celestial equator moving southward. Day and Night are of equal length. The sun rises due east and sets due west everywhere on Earth. This is the autumnal equinox in the Northern Hemisphere, the vernal equinox (Spring) in the Southern Hemisphere.

World Environmental Health Day addresses environmental health inequalities. While environmental health may be concerned primarily with the impacts of environmental stressors on health, these in turn are heavily influenced by and frequently reflect economic and social factors.