With a simple words, Solstice and Equinox, is about the longest day in the year, the longest night in the year and the two dates when the day and the night are equal in duration. While the Equinox is the same in the northern and southern hemisphere, the longest day, and the longest night are different in different hemispheres, because the earth is tilted. Here are how they should be.
Northern Hemisphere
1. Vernal Equinox: 21 - 22 March, day and night are of approximately equal duration all over the planet.
2. Summer Solstice : 21 - 22 June, the longest day and the shortest night.
3. Autumnal Equinox: 21 - 22 September, day and night are of approximately equal duration all over the planet.
4. Winter Solstice : 21 - 22 December, the longest night and the shortest day.
Southern Hemisphere
1. Vernal Equinox: 21 - 22 March, day and night are of approximately equal duration all over the planet.
2. Summer Solstice : 21 - 22 June, the longest night and the shortest day.
3. Autumnal Equinox: 21 - 22 September, day and night are of approximately equal duration all over the planet.
4. Winter Solstice : 21 - 22 December, the longest day and the shortest night.
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