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: birthstones, crystals, lucky colors, and well-known people sharing each sign.
Core Concepts
Birth Chart Calculator
Enter your birth date, time, and location to find your actual sun, moon, and rising sign - 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 →Extras
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 →