A type of Mahānimitta (science of progonostication);
it deals with propounding of knowledge about the past and future by basing it on the motion of sun, moon etc.
raviśaśigrahanakṣatrabhagaṇodayāstamayādibhimtitānāgataphalapraviblwgapradarśanamantarikśam.
(TaVā 3.36)