General Guidelines for Auspicious Days:

1. Tithis (Lunar Days)

• Auspicious Tithis: Dwitiya (2nd), Tritiya (3rd), Panchami (5th), Saptami (7th), Dashami (10th), Ekadashi (11th), Trayodashi (13th), and Purnima (Full Moon) are considered good for buying property, vehicles, or valuables.
• Avoid: Amavasya (New Moon), Chaturthi (4th), Navami (9th), and Chaturdashi (14th) are generally avoided for such purchases.

2. Nakshatras (Lunar Constellations)

• Auspicious Nakshatras: Rohini, Mrigashira, Chitra, Anuradha, Pushya, Hasta, Swati, Shravana, Dhanishtha, Revati, and Uttara Phalguni are considered highly favorable for buying a house, car, or accessories.
• Avoid: Bharani, Kritika, and Ashlesha Nakshatras are generally avoided.

3. Days of the Week

• Auspicious Days:
  • Monday: Good for buying a home and items related to comfort and luxury.
  • Wednesday: Auspicious for buying vehicles, gadgets, and accessories.
  • Thursday: Excellent for purchasing property, vehicles, or valuables.
  • Friday: Ideal for buying luxury items, jewelry, and vehicles.
• Avoid: Saturday and Sunday are generally less preferred for such activities, though exceptions can be made based on specific planetary positions.

4. Planetary Considerations

• Moon’s Position: The Moon should be in a favorable position, preferably in an auspicious Nakshatra or in the 2nd, 4th, 5th, 7th, 9th, or 11th house from your natal Moon sign.
• Avoid Rahu Kalam and Yamagandam: These are considered inauspicious periods of the day and should be avoided for any significant purchases.

5. Festive Days

• Akshaya Tritiya: A highly auspicious day for buying gold, property, and other valuables.
• Dhanteras: A very auspicious day for buying gold, vehicles, and other assets.
• Diwali and Navratri: Generally considered good for making significant purchases.

Conclusion:

To determine the most auspicious day for you specifically, it’s best to consult with a Vedic astrologer who can take into account your birth chart (Kundli) and current planetary periods (Dashas). This personalized approach will ensure that the timing aligns with your unique astrological influences.

If you have a particular date or range of dates in mind, I can help you determine the best day and time for your purchase based on the general principles outlined above.