Vedic or Western: which should your product use?

The two systems use the same sky differently, and for a product the choice mostly comes down to who your users are.

The difference that matters

Western astrology uses the tropical zodiac, tied to the seasons. Vedic astrology uses the sidereal zodiac, tied to the stars. They are currently about 24 degrees apart, so most people have a different Sun sign in each. A user who "is a Leo" may see Cancer in a Vedic chart, so explain this before they think that you are wrong.

What users expect

Vedic users expect the Moon sign and nakshatra, the dasha timeline, doshas and matching, and the panchang.

Western users expect the Sun, Moon and rising signs, houses and aspects, transits, and synastry for couples.

Choosing

• Users in India, or a matrimony product: Vedic.
• Lifestyle and dating apps in the US and Europe: Western.
• A global app: offer both, but pick a default by region, and label which is which.

What changes in your product

The choice is more than a setting. Vedic charts are often drawn as a square, in the North or South Indian style, and Western charts as a wheel. Vedic timing comes mostly from dashas, which run for years, while Western timing comes from transits and progressions. Vedic users expect matching for marriage and a daily panchang, while Western users expect a daily horoscope by Sun sign and compatibility for couples.

So the screens, the notifications and the paid reports differ as well as the numbers. Plan the features from the system, not the other way round.

Can you use both?

Yes, and the catalogue has both behind one key. Keep them apart on screen. Mixing a tropical Sun sign with a sidereal dasha on one page confuses people and looks like a mistake.

Test both with real users before committing. A short survey asking for someone's sign usually tells you which system they already know.

If you are serving Vedic users, also decide your ayanamsha. Lahiri is the usual default.