Learn the Core Concepts
Plain-language explainers for the ideas that come up everywhere in astrology - written the same way as the rest of this site: descriptive, not predictive.
A sun sign is only one layer of a birth chart. The Core Concepts below cover the ideas that come up next - the moon and rising signs, elements and modalities, planets and houses. The Extras are lighter reference material: the moon phases calendar, birthstones, crystals, lucky colors, and well-known people sharing each sign.
Core Concepts
Birth Chart Calculator
Enter your birth date, time, and place to find your sun, moon, and rising sign, every planet from Mercury to Pluto, and your houses - runs entirely in your browser.
Calculate my chart →Moon Sign Meaning
What your moon sign represents in astrology, how it differs from your sun sign, and why it's called the emotional or inner-self layer of a chart.
Read more →Rising Sign (Ascendant) Meaning
What the ascendant represents, why it needs an exact birth time and place to calculate, and how it shapes first impressions.
Read more →Sun, Moon & Rising Explained
The "big three" that beginners hear about constantly - what each one covers and how they combine into one picture.
Read more →How to Read a Birth Chart
A beginner's walkthrough of what a natal chart actually shows, and a step-by-step approach to reading your own.
Read more →Zodiac Elements Explained
What fire, earth, air, and water represent, and which three signs belong to each element.
Read more →Zodiac Modalities Explained
What cardinal, fixed, and mutable represent, and which four signs belong to each modality.
Read more →Planets in Astrology
What each of the ten chart bodies represents, and which zodiac signs they rule.
Read more →The 12 Houses in Astrology
What each of the twelve houses in a birth chart represents, from identity to career to community.
Read more →Mercury Retrograde Meaning
What retrograde motion actually is, why Mercury's retrogrades get so much attention, and what the themes are said to be.
Read more →Zodiac Cusp Dates Explained
Why "cusp signs" are a common misconception, plus the full reference table of every sign's date range.
Read more →Astrology Terms Glossary
Plain-language definitions for the terms that come up constantly - aspects, houses, retrogrades, and more.
Read more →Moon Sign Guides
Moon in Aries
Moon in Taurus
Moon in Gemini
Moon in Cancer
Moon in Leo
Moon in Virgo
Moon in Libra
Moon in Scorpio
Moon in Sagittarius
Moon in Capricorn
Moon in Aquarius
Moon in PiscesRising Sign Guides
Extras
Moon Phases Calendar
Every new and full moon this year and next, with the sign each falls in, shown in your time zone - plus a calendar download.
See the dates →Which Sign Are You, Actually?
A 9-question personality quiz that matches your temperament to a sign by element and modality - no birthday required.
Take the quiz →Zodiac Sign Birthstones
The traditional gemstone commonly paired with each of the 12 zodiac signs.
Read more →Crystals for Each Zodiac Sign
The wellness-crossover crystal most often associated with each sign.
Read more →Lucky Colors & Numbers by Sign
A light, popular-astrology reference table of lucky colors and numbers for every sign.
Read more →Famous People by Zodiac Sign
Well-known public figures sharing each of the 12 zodiac signs, based on documented birth dates.
Read more →