Ayanamsa
In plain words
The size of the gap between the two zodiacs — about twenty-four degrees at the moment, and slowly growing.
In the tradition's terms
The offset between the tropical and sidereal origins, stated for an epoch or fixed by a named star.
In depth
The Oracle carries twenty-two, of three kinds: star-anchored (Lahiri puts Spica at exactly 180°), epoch-anchored, and zero-point (naming the year the two zodiacs last agreed). Star-anchored ones are computed from the star rather than looked up.