Text 1] The Advent of Lord Krṣṇa: Introduction
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His own worship to establish the principles of householder life.” ( Bhāg.  9.24.66)
The Yadu dynasty belonged to the family descending from Soma, the moon-god. Although the planetary systems are so arranged that the sun comes first, before the moon, Parikṣit Mahārāja gave more respect to the dynasty of the moon-god, the  soma-vaṁśa , because in the Yādava dynasty, descending from the moon, Krṣṇa had appeared. There are two different  kṣatriya  families of the royal order, one descending from the king of the moon planet and the other descending from the king of the sun. Whenever the Supreme Personality of Godhead appears, He generally appears in a  kṣatriya  family because He comes to establish religious principles and the life of righteousness. According to the Vedic system, the  kṣatriya  family is the protector of the human race. When the Supreme Personality of Godhead appeared as Lord Rāmacandra, He appeared in the  sūrya-vaṁśa , the family descending from the sun-god, and when He appeared as Lord Krṣṇa, He did so in the Yadu dynasty, or  yadu-vaṁśa , whose descent was from the moon-god. In the Ninth Canto, Twenty-fourth Chapter, of  Śrīmad-Bhāgavatam , there is a long list of the kings of the  yadu-vaṁśa . All the kings in both the  soma-vaṁśa  and  sūrya-vaṁśa  were great and powerful, and Mahārāja Parikṣit praised them very highly ( rājñāṁ cobhaya-vaṁśyānāṁ caritaṁ paramād-bhutam ). Nonetheless, he wanted to hear more about the  soma-vaṁśa  because that was the dynasty in which Krṣṇa had appeared.
The supreme abode of the Personality of Godhead, Krṣṇa, is described in  Brahma-saṁhitā  as the abode of  cintāmaṇi: cintāmaṇi-pra-kara-sadmasu kalpavṛkṣa-lakṣāvṛteṣu surabhīr abhipālayantam . The Vṛndāvana-dhāma on this earth is a replica of that same abode. As stated in  Bhagavad-gītā  (8.20), in the spiritual sky there is another, eternal nature, transcendental to manifested and unmanifested matter. The manifested world can be seen in the form of many stars and planets such as the sun and moon, but beyond this is the unmanifested, which is imperceptible to those who are embodied. And beyond this unmanifested matter is the spiritual kingdom, which is described in  Bhagavad-gītā  as supreme and eternal. That kingdom is never annihilated. Although material nature is subject to repeated creation and annihilation, that spiritual nature remains as it is eternally. In the Tenth Canto of  Śrīmad-Bhāgavatam , that spiritual nature, the spiritual world, is described as