“The law of nature is so subtle that every part of our body is influenced by the respective stars, and a living being obtains his working body to fulfill his terms of imprisonment by the manipulation of such astronomical influence. A man’s destiny is therefore ascertained by the birthtime constellation of stars, and a factual horoscope is made by a learned astrologer. It is a great science, and misuse of a science does not make it useless.
Mahārāja Parīkṣit or even the Personality of Godhead appear in certain constellations of good stars, and thus the influence is exerted upon the body thus born at an auspicious moment. The most auspicious constellation of stars takes place during the appearance of the Lord in this material world, and it is specifically called jayantī, a word not to be abused for any other purposes. Mahārāja Parīkṣit was not only a great kṣatriya emperor, but also a great devotee of the Lord. Thus he cannot take his birth at any inauspicious moment.”
[Śrīmad-Bhāgavatam 1.12.12, Purport]