Solstice happens when earth rotates on its axis and tells itself from the orbit around the Sun for about 23.4°. Because of the tilt seasons happen on our planet. Because the northern and southern hemispheres did not get equal amounts of sunlight within the time of full year. From the time of March to the time of September the hemisphere of the northern region events towards the Sun that’s why we get spring and summer seasons at that time.
However, from the time of September all the way to next March the northern hemisphere faces the opposite side of the Sun that’s why at that time we get autumn and winter seasons. Thanks to this arrangement the southern hemisphere season gets reversed in order at this time. Every year for two months, this is what we call the solstice. On earth it tilts itself from the axis around the orbit of the Sun.
The hemisphere which tilts towards the Homestar of the Earth faces the longest day in history while the hemisphere vegetables far away from the solar planet faces the longest night. When winter solstice comes on the northern hemisphere which by the way dates to December 22. That is the time when the summer solstice happens in the southern hemisphere.
When the summer solstice happens in the northern hemisphere on the 21 of June, then the winter solstice happens in the southern hemisphere. To your surprise other planets also experience solstices and equinoxes. Any planet which is in a tilted position on its rotational axis will see the solstice. When you look at the planetary scientists they use solstice and equinox to study and define seasons in the other planets.
For example, when you look at the tilts of the Venus planet then you will find out that it only deals around his axis for 3°. Which means there are a lot of differences. The even ocean weather does not change just as the Earth weather. Other planets like Mars do not show or circle around its orbit like earth, that’s why their distance from the sun is dramatically more than the Earth. This difference puts all of the other planets in a lot of different effects of season than earth.
These kinds of celestial events matter the most in many cultures all around the world. For millennial years the celestial events are helping many societies and cultures to build their own structure so they can align with the solstice of each season. Some cultures celebrate the souls andthrow festivals for the owner of each solstice.
The structure of Stonehenge and its purpose is not known to us, but we know that this monument is 5000 years old. It has a relationship with the soul test that we do not know right now.