The intersection in the Sagittarius/Scorpius part of the zodiac is visually impressive, and is also the area of “galactic center.”(*5) If the Sun is central to the solar system, galactic center is like the central Sun that all the stars of the galaxy circuit. When the equinox or solstice points are aligned with the Sagittarius/Scorpius intersection, the Sun rises at galactic center on those dates! This occurs about every 6480 years and marks a change of Platonic Seasons. It’s happening now. According to the calculations of Astronomer Jean Meuss(*6) (famous for calculating stellar occultations), the winter solstice coordinate exactly reaches the intersection of the plane of the Milky Way with the zodiacal plane in May of 1998. This is the only time in the 26,000 year precessional cycle that the December solstice (or winter solstice in North America) is aligned with galactic center.
The Sumerian/Babylonian civilizations chose a spring equinox calendar and modern astrologers and astronomers still use it. There are two possible reasons for this choice. For one thing, around 4000 BC, the equinoxes were in alignment with the Milky Way/Zodiac intersection. This was one whole Platonic season before now. The cosmic frame of reference had an equinox priority then. Secondly, during the third millennium BC, the spring equinox formed precise alignments with the royal star Aldebaran and then with the Pleiades. The rising Sun at spring equinox was conjunct the Pleiades during the very same years that the Sun rose at summer solstice with the royal star Regulus. All that must have been quite impressive and worthy of creating a calendar! So, at that time, the Sun rising in the Sagittarius/Scorpio zone (or Galactic Center) at the autumnal equinox was overshadowed by the dramatic celestial events occurring in the constellations of Taurus and Gemini.
When sharing this material over the past ten years, I have found it is the native and traditional peoples of shamanic orientation who most easily resonate with this information. This is largely because they ceremonially “work” the cycles of the Earth and sky. They know what the winter solstice is. It is the time of the greatest density, the deepest descent of spirit into matter, the longest night, and then the return, or rebirth, of the Sun. It is the turning of the year. The winter solstice, not coincidentally, was chosen by the current world culture (through its secular calendar) to be the most important of the four calendar turning points, to mark the turning of a solar year.
My sense is that the December solstice has the higher calendric priority (in this case, more than the equinoxes) for marking the end and beginning of an entire Platonic year, because of the primacy the shamanic and traditional cultures give to the December solstice. However, there can be a great stimulating debate on this issue. At the very least, we know humanity is at a seasonal shift. If now isn’t the end and beginning of the Platonic year, then my feeling is the next most likely possibility is the “mirror image” of now, 12,500-13,000 years ago, when the December solstice was at galactic anti-center, in the Gemini/Taurus region. This marked the time when the vernal (spring) equinox was entering the constellation of the Lion (represented by the Lion Sphinx of Giza, facing due east as silent witness to those historical events). Today, the sphinx witnesses the spring equinox’s entry into the constellation of the Waterbearer, or Aquarius.