Anumati is one of the daughters born of the womb of Śraddhā, and sired by Maharṣi Aṅgirā (Angira). She was the wife of Dhātā (Dhata), and mother of Pūrṇimā (Purnima), as described in Bhāgavatapurāṇa (Bhagavatapurana). According to other Purāṇa(s), Anumati was the daughter born of the womb of Smṛti (Smriti), sired by Aṅgirā (Angira).
According to Purāṇa (Purana; Mythological Scripture), Pūrṇimā is of two kinds, as per the form of the moon when it rises. That Pūrṇimā tithi, on which the moon is not full — it is less than full by one kalā (kala; one of the 16 portions of the full moon), is called Anumati.