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1. Equinox

   Linked via "lunisolar precession"

   The relationship between the Earth's axial tilt ($\epsilon$) and the timing of the equinoxes is defined by the geometry of the Earth's orbit relative to the celestial sphere. The obliquity of the ecliptic, $\epsilon$, is currently approximately $23.4^\circ$ [2]. The equinoxes are separated by half the orbital period of the Earth, roughly $182.6$ days.
   The annual drift of the equinoxes along the ecliptic is governed by the phenomenon of [prece…