The Autumnal Equinox 2015

The equinox happens when the equator passes the centre of the sun. This is when the north and south poles of the Earth are not tilted towards or away from the sun, as at other times, but are aligned so as to give, theoretically, the same amount of daylight in both of the Earth's hemispheres. The word equinox is derived from the Latin, meaning equal night. After the autumnal equinox, the days get shorter and the nights get longer. Traditionally it signified when the farmers bought in the harvest, which perhaps explains why the full moon nearest the equinox is often called the harvest moon. (Telegraph)