Narapatijayacarya 3.1.3.48

3.1.3.48

ghaṭikākhye dine pakṣe māse ṛtvayane tathā ||
varṣe dvādaśavarṣe ca avasthā jāyate svare ||

In the [period] called a ghaṭikā, in a day, a lunar fortnight, a month, likewise in a season and solstitial half-year,
and in a year and in a twelve-year period, the state arises in a sound.