Why your sun sign is one twelfth of the story
“I'm a Cancer, I'm supposed to be sensitive.” That sentence is where most people's astrology begins and ends. The chart is much bigger than that.
Ask someone their sign and they will give you one word — the zodiac sign the sun occupied when they were born. In casual astrology that word does all the work. In the astrology astrologers actually practice, it is one element among dozens, and two people with the same sun sign can have charts that barely resemble each other.
A Cancer sun with a Gemini moon and a Cancer sun with a Scorpio moon are, in the tradition's own terms, different people: the same core warmed by a restless, talkative emotional style in one case and an intense, guarded one in the other. Add a rising sign, seven more planets, twelve houses and the geometry between them, and the one-word version starts to look like judging a book by one letter of its title.
What a chart actually contains
A birth chart is a map of the sky at the minute and place of birth. Its working parts:
- Ten planets (astrology counts the sun and moon among them), each standing for a function — Venus for affection and taste, Mars for drive and temper, Saturn for discipline and limits, Mercury for thinking and speech.
- Twelve signs, the styles those functions are expressed in.
- Twelve houses, the areas of life where they play out — money, work, partnerships, home.
- Aspects, the angles between planets, which the tradition reads as how those functions cooperate or grind against each other.
Start with the parts of a chart for each piece in turn, or with sun and moon for the pair that does the most explanatory work. There is also a short page on computed reports — what the software-written readings this domain once sold actually were — and a page of related links.
One thing this site is not: evidence that astrology works. Controlled tests have not been kind to astrological prediction, and this guide will not pretend otherwise. Astrology remains worth understanding on its own terms — as a symbolic language people have thought in for four thousand years — and that is the spirit here.