Skandapurana 5.206.4

5.206.4

varṣāṃte kāni cāhāni yeṣu śakro dharātale ..
samāgacchati ko māsa etatsarvaṃ bravīhi me .. 4 ..

And at the end of the year, which are the days on which Indra / comes to the earth, and what is the month? Tell me all this!