On Sunday, February 25, 2018 at 2:07:43 AM UTC-7, Gerald Kelleher quoted, in part:
Therefore, while the earth's center always remains in the plane of the ecliptic,
that is, in the circumference of a circle of the Grand Orb, the earth's poles
rotate, both of them describing small circles about centers [lying on a line
that moves] parallel to the Grand Orb's axis." Copernicus, Commentariolus

The idea that the Earth's poles, instead of remaining fixed, always pointing in
the same direction, as the Earth revolves around the Sun, *rotate* in a circle
around _ecliptic_ north...

is currently considered to be mistaken by the astronomers of today.

And yet, who would dare to dispute with the great Copernicus?

Ah, but could it not be that since Copernicus - except for an ancient Greek,
whose insights had been discarded and forgotten - was the _first_ to see that
the Earth orbited the Sun, even as the Moon does the earth, if he tried to speak
in a fully Copernican language, he would have no one to understand him?

And so, it is entirely to be understood and forgiven that he had to express his
discoveries and insights in geocentric language.

John Savard