By the time I complete this post, spring will have sprung. The vernal equilux happens when the sun spends equal time above and below the equator, and is marked by approximately 12 hours of darkness, followed by 12 hours of daylight.
Throughout history, this annual event was a day for celebration. The celebrations were a way to rejoice in the rebirth of nature and to ritually act out this seasonal change, from the symbolic death of the earth in winter to its resurrection through the budding and blooming that came after the equinox.
Some cultures marked the event by decorating stones with a story board
See a video here of the symbols of the sun engraved on the back stone of Cairn T at Loughcrew, Ireland. As with many ancient megalithes, this one seems to have been built so precisley that it’s position measures the suns movement. The shadows cast by the sun on the day of the equinox seem to be mapped to the ancient drawings on the back stone.
I find these events incredibly interesting, and this day in particular, a day of renewal.
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I Want What I Have 
You’ve mixed equilux and equinox almost interchangeably here. They are different in definition, and are always on different days with the exception of one special locus of points on the earth). Check it out on wikipedia for the details. After you read it, see if you can figure out what the special locus of points is.