Mahabharata 3.213.30

पर्व चैव चतुर्विंशं तदा सूर्यमुपस्थितम्तथा धर्मगतं रौद्रं सोमं सूर्यगतं च तम्

parva caiva caturviṃśaṃ tadā sūryamupasthitamtathā dharmagataṃ raudraṃ somaṃ sūryagataṃ ca tam

Our plain-language meaning of this verse is waiting for scholar review.