File:N pole precession.png

English: The outer line with timescale shows the projection of the precession path of the north pole of the Earth on the fixed sky of the epoch J2000.0 for the time interval from 48000 BCE to 52000 CE. The inner line shows the projection of the precession path of the north pole of the Earth's orbit for the same time interval. The dependencies ψ_A and ω_A are used for the precession of the Earth rotation, the dependencies P_A and Q_A are used for the precession of the ecliptic ^[1]. The white plus indicates the direction of the north pole of the invariable plane ^[2]. A cyan grid indicates an ecliptic coordinate system and yellow indicates the equatorial coordinate system for the epoch J2000.0. The stars are shown no darker than the magnitude 5.