precession of the equinoxes
Fr.: précession des équinoxes
The slow motion of the equinoxes along the ecliptic, resulting from
the combined motion of the equator (→ precession of the equator)
and the ecliptic (→ precession of the ecliptic), or in other words the
precession of the Earth's axis of rotation.
Also know as → general precession.
The First Point of Aries moves westward along the ecliptic at 50.38 arcseconds
per year (1 degree every 71.6 years), causing the equinoxes to occur
about twenty minutes earlier each sidereal year.
See also → nutation.