How Not to Kill Your Bhakti by Using Astrology?



The specific science of learning all Vedic sciences is that one starts with the source: janmadasya yatha are the first three words of the Bhagatam (Bhagavat Purana). It is the Supreme Lord, Lord Krishna who is the source of everything in all of existence - the realm beyond the brahmajyoti i.e., the transcendental realm of Vaikuntha and here in the material universes of the karana ocean (causal ocean in which all the universes are buoyant).

How does a devotee look upon any material Vedic science, in this context astrology?


He looks upon it from the Bhagvan outlook (darshana) as opposed to the paramatma outlook or the totally non-Krishna conscious vaishnava sampradaya mataviruddha outlook i.e., bramajyoti outlook.
Astrology is Lord Krsna's orders.
When we follow Lord Krsna's order He becomes happy. This is the purpose of not just the devotee's life but the life and existence of all souls. When Lord Krsna sees that His devotee is following His order, in the matter of astrology, He becomes happy. It is that satisfaction of Lord Krsna that makes the whole science work. And the vaishnava has no business expect for this understanding and that is sufficient for him to take up astrology and consequent remedies.

Do gems have power to help you?


Nothing is independently powerful from Lord Krishna. It is only because gems are created and recommend by Lord Krishna in the universe whose laws He has made that the gems or any artifact in the universe has any power whatsoever. When a embodied soul wear those gems or takes any ayurvedic medicine for the matter, He is following Lord Krishna's order, this makes the Lord smile. It is that smile of the Lord that blesses the gem and bestows upon the wearer whatever the Lord had originally decided for that particular gem's effect to be. And this is the only vision that a devotee of Lord Krsna should have towards astrologically recommended gems. Otherwise if the devotee imagines that there is some power in some gem and that this power is something divorced from Lord Krishna...then...well...how do you define maya? Maya is that which is separate from Lord Krsna. So one should not turn something that Lord Krsna wished for to be used in his service (in the relative sense) into maya.

(epilogue:

Krishna has give through the same heart from which we receive the bhagavatam.

(tene — imparted; brahma — the Vedic knowledge; hṛdā — consciousness of the heart; yaḥ — one who; ādi-kavaye — unto the original created being)

Vedic astrology comes to the universe from Lord Brahma's heart and then it from there gets delivered to Vyasadeva then it is transmitted to human beings.)