Birth Chart Calculator

Understanding Your Birth Chart

A natal birth chart maps the positions of celestial bodies at your exact time and place of birth. Sun sign represents your core identity and conscious self. Moon sign reflects your emotional nature and subconscious. Rising sign (ascendant) shows how you present yourself to the world. Birth time is essential for accurate rising sign calculation. Chart interpretation considers all planetary positions, houses, and aspects for a complete astrological profile.

The Three "Big Three" Placements

In astrology, the Sun, Moon, and rising (ascendant) signs are nicknamed the "big three" because together they sketch a fuller picture than the Sun sign alone. The Sun sign is set by the date of birth and corresponds to the date ranges in the table above. The Moon sign depends on the date and roughly the time, because the Moon moves through a sign in about two to two-and-a-half days. The rising sign changes roughly every two hours as the Earth rotates, so it requires an accurate birth time and birthplace to calculate — which is why an unknown or estimated birth time makes the ascendant uncertain. Beyond these three, a complete chart also positions Mercury, Venus, Mars and the outer planets across twelve houses and notes the angular relationships ("aspects") between them. Astrology is a symbolic tradition used for reflection and entertainment rather than a science, and the date ranges can shift by a day from year to year because the Sun's entry into each sign is fixed to its position, not the calendar.

Frequently Asked Questions