yadā - when; maghābhyaḥ - from Maghā; yāsyanti - they will go; pūrva-āṣāḍhām - to the next lunar mansion, Pūrvāṣāḍhā; mahā-ṛṣayaḥ - the seven great sages; tadā - then; nandāt - beginning from Nanda; prabhṛti - and his descendants; eṣaḥ - this; kaliḥ - age of Kali; vṛddhim - maturity; gamiṣyati - will attain.

When the great sages of the Saptarṣi constellation pass from Maghā to Pūrvāsāḍhā, Kali will have his full strength, beginning from King Nanda and his dynasty.