This Bhagavad-gītā, science of Bhagavad-gītā, is not a new presentation. Just from this verse we can understand that it was instructed to the sun-god. Sun-god, apart from what is the duration of age of sun-god, but from the Manu, because the next statement is vivasvān manave prāha . . . Vivasvān. The sun-god's name is Vivasvān.
Just like your the chief executive head is called the president, similarly, there is a chief executive head also in the sun planet, president. And the present president's name is . . . just like your present president's name is Mr. Nixon, similarly, the present predominating deity in the sun planet is known as Vivasvān.
So everything is in detail. This is called Vedic literature. Vedic literature is not concerned only with this planet. Vedic literature deals with all the universal planets. Just see, here is the statement. Kṛṣṇa says that "In the beginning I explained this science of Bhagavad-gītā to the present predominating deity of sun planet, whose name is Vivasvān."
So do you think that Kṛṣṇa is playing joke or speaking something lie, that he said to Vivasvān, the present presiding deity? No, that is not possible. Actually He has spoken. And Kṛṣṇa . . . one . . . others may think of Kṛṣṇa, avajānanti māṁ mūḍhāḥ (BG 9.11). Rascals and fools may think of Kṛṣṇa as ordinary man. But in India the great ācāryas, just like Śaṅkarācārya, Rāmānujācārya, Madhvācārya, Lord Śrī Caitanya Mahāprabhu—practically these ācāryas are guiding the whole destiny of the Hindu world—they have all accepted Kṛṣṇa, the Supreme Personality of Godhead. So whatever Kṛṣṇa is speaking, that is right.
Now, you can understand that if Kṛṣṇa spoke to the sun-god, and the sun-god spoke to his son Manu, then how old is this science of Bhagavad-gītā. Apart from sun-god's duration of age, if we simply take the present age, Vaivasvata Manu . . . Vaivasvata Manu, the age of Vaivasvata Manu is seventy-one multiplied by forty-three hundred thousands of years.
Forty-three hundred thousands of years multiplied by seventy-one. It is a very long duration of life. Now, at the present moment the Vivasvān . . . the Vaivasvata Manu's age is half-finished. That means the number, the numerical strength, forty-three hundred thousands of years into seventy-one, divide by two. So long years Bhagavad-gītā was spoken.
So Bhagavad-gītā is not a new thing, a new adventure. And the person who spoke Bhagavad-gītā to the sun-god, does it mean that He left something to be commented by some . . . these mundane man to understand the meaning of the Bhagavad-gītā? Such a great personality, the Supreme Personality of Godhead, He told something which is to be understood by the interpretation of a mundane scholar? Do you think it is reasonable? No. Whatever He spoke, that is all right. And that is clear. There is no question of interpreting in a different way.