Free Astrology Calculator & Natal Chart Hub

Yes. Our two-tier engine calculates a 12:00 PM UTC reference and computes a 26-hour span for the Moon and all major planets. Because the Sun, Mercury, Venus, Mars, Jupiter, and Saturn move relatively slowly, their sign placements are virtually 100 percent guaranteed. For the Moon, which travels roughly 13 degrees per day, our system checks whether it crossed a sign boundary during your birth date and flags the exact degree window.

Western astrology uses the Tropical zodiac, which fixes the start of Aries to the March vernal equinox. Due to the astronomical precession of Earth’s equinoxes (a slow wobble taking approximately 25,772 years), the actual background constellations have shifted by roughly 24 degrees. Vedic astrology accounts for this shift using the Lahiri ayanamsha, meaning your Sun and planetary positions in Vedic charts will often be one zodiac sign earlier than in Western charts.

The Big Three comprise your Sun Sign (conscious ego, vital essence, and core purpose), your Moon Sign (emotional processing, instinctual needs, and inner subconscious mind), and your Rising Sign or Ascendant (the zodiac sign rising on the eastern horizon at birth, representing your external personality, physical vitality, and initial impression on the world).

The Swiss Ephemeris is based on NASA Jet Propulsion Laboratory (JPL) planetary numerical integrations (DE440). It accounts for gravitational perturbations from all solar system bodies, relativistic effects, and precise lunar orbital theories, providing astronomical accuracy to within fractions of an arcsecond.