176
Śrīmad-Bhāgavatam
[Canto 6, Ch. 10]
one day of Brahmā there are fourteen Manus, who each live for seventy-one millenniums. The four  yugas —Satya, Tretā, Dvāpara and Kali—constitute one millennium. We are presently in the  manvantara  of Vaivasvata Manu, who is mentioned in  Bhagavad-gītā  ( imam vivasvate yogam proktavān aham avyayam/ vivasvān manave prāha ). We are now in the twenty-eighth millennium of Vaivasvata Manu, but this fight took place in the beginning of Vaivasvata Manu's first millennium. One can historically calculate how long ago the battle took place. Since each millennium consists of 4,300,000 years and we are now in the twenty-eighth millennium, some 120,400,000 years have passed since the battle took place on the bank of the River Narmadā.
TEXTS 17–18
रुद्रैर्वसुभिरादित्यैरश्विभ्यां पितृवह्निभिः ।  
 मरुद्भिर्ऋग्भुभिः साध्यैर्विश्वेदेवैर्मरुत्पतिम् ॥१७॥  
 दृष्ट्वा वज्रधरं शक्रं रोचमानं स्वया श्रिया ।  
 नामृष्यन्नमुरा राजन् मृधे वृत्रपुरःसराः ॥१८॥
rudrair vasubhir ādityair 
    aśvibhyām pitṛ-vahnibhiḥ 
    marudbhir ṛbhubhiḥ sādhyair 
    viśvedevair marut-patim
dṛṣṭvā vajra-dharam śakram 
    rocamānam svayā śriyā 
    nāmṛṣyann asurā rājan 
    mṛdhe vṛtra-puraḥsarāḥ
rudraiḥ—by the Rudras; vasubhiḥ—by the Vasus; ādityaiḥ—by the Ādityas; aśvibhyām—by the Aśvinī-kumāras; pitṛ—by the Pitās; vahnibhiḥ—and the Vahnis; marudbhiḥ—by the Maruts; ṛbhubhiḥ—by the Rbhus; sādhyaiḥ—by the Sādhyas; viśve-devaiḥ—by the Viśvadevas; marut-patim—Indra, the heavenly King; dṛṣṭvā—seeing; vajra-dharam—bearing the thunderbolt; śakram—another name of Indra; rocamānam—shining; svayā—by his own; śriyā—opulence; na—