( n. )
A very small libratory motion of the earth's axis, by which its inclination to the plane of the ecliptic is constantly varying by a small amount.
( n. )
A very small libratory motion of the earth's axis, by which its inclination to the plane of the ecliptic is constantly varying by a small amount.
Webster's Revised Unabridged English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012