Śrīmad-Bhāgavatam 3.11.18
మైత్రేయ ఉవాచ
కృతం త్రేతా ద్వాపరం చ కలిశ్చేతి చతుర్యుగమ్ ।
దివ్యైర్ద్వాదశభిర్వర్షై: సావధానం నిరూపితమ్ ॥ ౧౮ ॥
maitreya uvāca
[maitreya uvaacha]
kṛtaṁ tretā dvāparaṁ ca
[kritam tretaa dvaaparam cha]
kaliś ceti catur-yugam
[kalish cheti chatur-yugam]
divyair dvādaśabhir varṣaiḥ
[divyair dvaadashabhir varshaih]
sāvadhānaṁ nirūpitam
[saavadhaanam niroopitam]
Word-for-word
maitreyaḥ uvāca
—
Maitreya said
kṛtam
—
the age of Satya
tretā
—
the age of Tretā
dvāparam
—
the age of Dvāpara
ca
—
also
kaliḥ
—
the Age of Kali
ca
—
and
iti
—
thus
catuḥ-yugam
—
four millenniums
divyaiḥ
—
of the demigods
dvādaśabhiḥ
—
twelve
varṣaiḥ
—
thousands of years
sa-avadhānam
—
approximately
nirūpitam
—
ascertained.
Blended reading (Sanskrit + English inline)
maitreya uvāca
maitreyaḥ uvāca
Maitreya said
kṛtaṁ tretā dvāparaṁ ca
kṛtam
the age of Satya
tretā
the age of Tretā
dvāparam
the age of Dvāpara
ca
also
kaliś ceti catur-yugam
kaliḥ
the Age of Kali
ca
and
divyair dvādaśabhir varṣaiḥ
sāvadhānaṁ nirūpitam
iti
thus
catuḥ-yugam
four millenniums
divyaiḥ
of the demigods
dvādaśabhiḥ
twelve
varṣaiḥ
thousands of years
sa-avadhānam
approximately
nirūpitam
ascertained.
Maitreya said: O Vidura, the four millenniums are called the Satya-, Tretā-, Dvāpara- and Kali-yuga. The aggregate number of years of all of these combined is equal to twelve thousand years of the demigods.
Purport
The years of the demigods are equal to 360 years of humankind. As will be clarified in the subsequent verses, 12,000 of the demigods’ years, including the transitional periods which are called yuga-sandhyās, comprise the total of the aforementioned four millenniums. Thus the aggregate of the above-mentioned four millenniums is 4,320,000 years.
— A.C. Bhaktivedanta Swami Prabhupāda
Gauḍīya Ācāryas
Viśvanātha Cakravartī Ṭhākura
Gauḍīya
Translation
Maitreya said: The four yugas of Satya, Treta, Dvāparā and Kali are described as twelve thousand years of the devatās, including the sandhyā portions.
The life spans of Bhrgu and others beyond the kalpa are equal to that of Brahmā. In order to explain the lifespan of Brahmā, the calculation of the yugas is explained. Varsaiḥ means by a thousand years. Avadhānam here means “that which is deposited.” It refers to the sandhyās at the beginning and end of the yuga.
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Source: vedabase.io