For what it may be worth -- or not -- since beyond physical astronomical & geographical aspects of the actual event and its implications, whatever mathematical derivatives may exist otherwise, evade my cognitive awareness:
transposed on the EclipticPole, Earth's axial gyration -- associated with true Polar wander -- scribe 2 circles, each 72° diameter, that form a VesicaPisces with a mutual interlocking factor of 14°.
The min. & max. obliquity action, interestingly, pendulum between the ZodiacConstellations Virgo & Pisces, with apogee (and) perigee of 14 & 58 degrees respective the EP. The sum thereof comprise the path of each Pole - thus a circle of 72 degrees. The driver of which is Earth rotating 360° and whereby the Equinox is advanced 2x 180°.
GreatPyramid measures in context of time & geodesy
Edited 1 time(s). Last edit at 04-Jan-20 17:27 by hendrik dirker.