Western astrology starts the zodiac at the March equinox, Vedic astrology at the stars, and the two sit about 24° apart. So the Sun reaches Aries about 24 days later in the Vedic zodiac, and most people with a Western Aries Sun have a Vedic Pisces Sun.
When the Sun is in Aries
Western Aries
20 Mar – 19 Apr
Vedic Aries
13 Apr – 13 May
Western Aries: your Vedic Sun
Born 20 Mar – 12 Apr
Vedic Sun in Pisces
Born 13 Apr – 19 Apr
Aries in both zodiacs
Dates for someone born around 1990, in UTC. They move a day either way with the birth year and time; a chart in Unseen Signs is exact to the minute.
The nakshatras of Vedic Aries
Vedic astrology also divides the sky into 27 nakshatras, the lunar mansions. Vedic Aries holds:
The same 24° shift applies to every planet and to the rising sign, so most charts change in several places at once. Your birth date, time and place show your Sun, Moon and rising sign in both zodiacs.