1[mass noun] The slow retrograde motion of equinoctial points along the ecliptic.
- ‘He was not the first Chinese astronomer to discover the precession of the equinoxes (Yu Xi did so in the fourth century) but he was the first to take this into account in calendar calculations.’
- ‘About fifty years after Liu's remarkable contributions, a major advance was made in astronomy when Yu Xi discovered the precession of the equinoxes.’
- ‘The gravitational pull of the sun and moon cause a phenomenon known as the precession of the equinoxes, which makes the earth's axis move in a cone shape.’
- ‘Because of the precession of the equinoxes, the equinox and solstice points have each moved westward about 30 degrees in the last 2,000 years.’
- 1.1The resulting earlier occurrence of equinoxes in each successive sidereal year.