Dvāpara-yuga means just during the Mahābhārata time. Mahābhārata time, five thousand years before, that was the end of Dvāpara-yuga. Then, after the Battle of Kurukṣetra, this Kali-yuga has begun, Kali-yuga, this age, present age which we are passing on. In this age, this Kali-yuga will exist . . . from the Vedic scriptures we understand, it will exist for 400,000 years—400,000's of years, 427,000's of years . . . not 27, 32. Out of that, we have passed only 5,000 years. So there is balance still, 427,000's of years, to finish this Kali-yuga, this age of . . .
Now, for this age . . . kṛte yad dhyāyato viṣṇuṁ tretāyāṁ yajato makhaiḥ. Now, different ages, different methods are prescribed. So for this age, it is prescribed that kalau tad dhari-kīrtanāt. Whatever possible to perform in the Satya-yuga by meditation and the Tretā-yuga by offering of great, I mean to say, costly sacrifices, and in the Dvāpara-yuga by offering prayers or arcanā in the temples, that can be made possible easily by hari-kīrtana, by chanting the holy name of God. That is the prescription.
So, as the Bhagavad-gītā prescribes that you have to perform yajña, now, don't be afraid that you have to perform the same kind of yajña as it was being performed in the Tretā-yuga or Dvāpara-yuga by offering thousands and thousands of maunds of clarified butter and grains. That is not possible. Nobody can secure all those ingredients at the present moment, neither it is recommended. In the Kali-yuga it is recommended that one can perform the saṅkīrtana-yajña. That will give him the same result which was derived by meditation in Satya-yuga.