Skandapurana 5.271.8

5.271.8

sa devānāmahorātraṃ purāṇajñāḥ pracakṣate ..
ayanaṃ cottaraṃ śuklaṃ yaddevānāṃ dinaṃ ca tat ..
yaddakṣiṇaṃ tu sā rātriḥ śubhakarmavigarhitā .. 8 ..

The knowers of the Purāṇas declare that to be a day and night of the gods: / the northern solstice, which is bright, is the day of the gods; / that which is the southern is the night, censured for auspicious rites. 8.