Anomalistic

01 a. Irregular; departing from common or established rules.

1.
Irregular; departing from common or established rules.
2.
Pertaining to the anomaly, or angular distance of a planet from its perihelion.(Astron.)

Phrases & compounds

Anomalistic month — See under Month.

Anomalistic revolution — the period in which a planet or satellite goes through the complete cycles of its changes of anomaly, or from any point in its elliptic orbit to the same again.

Anomalistic, [or] Periodical, year — See under Year.