Mahabharata 14.39.18

अहस्त्रिधा तु विज्ञेयं त्रिधा रात्रिर्विधीयतेमासार्धमासवर्षाणि ऋतवः संधयस्तथा

ahastridhā tu vijñeyaṃ tridhā rātrirvidhīyatemāsārdhamāsavarṣāṇi ṛtavaḥ saṃdhayastathā

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