Mahabharata 8.24.83

विचित्रमृतुभिः षड्भिः कृत्वा संवत्सरं धनुःतस्मान्नॄणां कालरात्रिर्ज्या कृता धनुषोऽजरा

vicitramṛtubhiḥ ṣaḍbhiḥ kṛtvā saṃvatsaraṃ dhanuḥtasmānnṝṇāṃ kālarātrirjyā kṛtā dhanuṣo'jarā

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