Śrīmad-Bhāgavatam · Text 12.2.31
Who is speaking and story frame
यदा देवर्षय: सप्त मघासु विचरन्ति हि ।
तदा प्रवृत्तस्तु कलिर्द्वादशाब्दशतात्मक: ॥ ३१ ॥
yadā devarṣayaḥ sapta
maghāsu vicaranti hi
tadā pravṛttas tu kalir
dvādaśābda-śatātmakaḥ
When the constellation of the seven sages is passing through the lunar mansion Maghā, the Age of Kali begins. It comprises twelve hundred years of the demigods.
Read this verse on Vedabase.ioThis verse has no purport; its meaning is explained by the verses around it.
From Canto 10, chapter 14 onward, the translation and purports were completed by Śrīla Prabhupāda's disciples after his departure, and published by the Bhaktivedanta Book Trust.