The Lagna changes approximately every because of Earth's rotation. To find the Lagna accurately, one needs: The exact date of birth . The exact time of birth . The place of birth (to account for local sunrise times). Sri Lankan Astrology, Reading Life With Nature and Maths
Western signs use the Tropical zodiac (based on seasons). Sinhala/Vedic astrology uses the Sidereal zodiac (based on fixed stars). Therefore, your Western sign will be about 23 degrees earlier (e.g., Western Aries is usually Sinhala Mesha, but a Western Taurus may be a Sinhala Mesha). 12 lagna name sinhala