Two Zodiacs, One Sky

Why Western and Vedic astrology give you different signs, explained clearly.

Most people meet astrology through the Western (tropical) zodiac. Vedic astrology uses the sidereal zodiac, and the two have drifted apart. Here's the difference.

Two-ring zodiac wheel showing the ~24 degree drift between the tropical (Western) and sidereal (Vedic) zodiacs, Earth at the center

Tropical / Western

Anchored to the seasons. 0° Aries is fixed to the spring equinox, so it maps Earth's tilt and the Sun, not the stars behind the Sun.

Sidereal / Vedic (Jyotiṣa)

Anchored to the fixed stars. 0° Aries stays aligned with the real constellations, set by an ayanāṁśa (Lahiri is standard). This is the framework of Vedic astrology.

The Drift

Earth wobbles like a spinning top (precession), moving the equinox about 1° every 72 years. Over roughly 1,700 years the two zodiacs have drifted about 24° apart.

The Takeaway

Because the sidereal zodiac sits about 24° behind, most Western placements fall in the previous sign in Vedic. The first ~24° of a Western sign shift back a sign; only the last ~6° stay the same, so an early or mid Taurus is an Aries in Jyotiṣa, while a late Taurus stays Taurus.

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