30 September, 2004 Halley
Equinoxes and Solstices
In the Northern hemisphere the Equinoxes are the two times each year when the length of the day equals the length of the night and are the Vernal Equinox when spring begins on the 20th March and the and autumnal Equinox when Autumn begins on the 22nd September.
The Solstices are the day with the longest day and the longest night and are Midsummer Day on the 24th of June and Midwinter day on the 21st of December.
Here in the southern hemisphere spring and autumn are reversed as are summer and winter.