Narapatijayacarya 3.1.3.56

Thus there are sixty states always within the pentad of states.
In all of them, the result is to be understood as corresponding to their own names.

"Infant sound, etc.": The states beginning with the infant sound are twelve in number, [represented by] the suns. These twelve states arise in order according to the measure of their respective elapsed periods, according to the measure of their respective durations. In what is called a ghaṭikā, in a day, in a lunar fortnight, in a month, in a season, in a solstitial half-year, and in a phoneme, twelve states arise. "The palas of an asterism, etc.": The ghaṭī-sound is [measured by] the palas of an asterism, [being] five ghaṭīs, [or more precisely] in five daṇḍas increased by twenty-seven palas: 2 | 27. Here, a twelfth part is taken as the palas of an asterism. In a day, [i.e.,] in a tithi consisting of sixty daṇḍas, the twelfth part is five daṇḍas. In a lunar fortnight, a day with a quarter, [namely] a day plus a quarter: 1 | 15. In a month, the twelfth part is two and a half days: 2 | 30. In a season, the twelfth part is six days: six days. In a solstitial half-year consisting of six zodiacal signs, the twelfth part is a lunar fortnight: 15. In a year, a month is the twelfth part. In a twelve-year period, one year is the twelfth part. In this way, by the measure of duration, the states occur in order. "The traversed sound, etc.": If one wishes to know the state of a sound such as the infant [sound] within the ghaṭī-sound, etc., it is stated by him: