The same framework that accounts for the faster-moving Venus and Mercury where the Sun is set up as a central reference by the orbital motion of the Earth and the annual change in the position of the stars is also the framework which accounts for the
dispute and unresolved issue of the third motion or the separate rotation Copernicus assigned initially to the Earth in his Commentariolus.
The precession of the equinoxes is a property of the proportion of 1461 days/rotations to 4 years/orbital circuits including the extra day/rotation at the end of the fourth 365-day cycle. The proportion reduces to 365 1/4 rotations per orbital circuit
and the important thing it is derived through the calendar system rather than by direct observation so because the proportion is not exact. there is a slight drift in the annual motion of the stars in the same manner as Sirius drifts by one day across 4
orbital circuits using the same reasoning-
".. on account of the procession of the rising of Sirius by one day in the course of 4 years,.. therefore it shall be, that the year of 360 days and the 5 days added to their end, so one day shall be from this day after every 4 years added to the 5
epagomenae before the new year" Canopus Decree 238 BC
The Decans framework through which that exquisite conclusion is based was unknown to Copernicus, Kepler and Galileo as they used the Ptolemaic observation of the Sun moving through the constellations in order to form a hypothesis from a moving Earth. The
older framework, when allied with a satellite orbiting along with the Earth with its focus on the central Sun doesn't require a hypothesis other than the stars change position from left to right as a product of the Earth's orbital motion-
https://sol24.net/data/html/SOHO/C3/96H/VIDEO/
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