When someone in India says they want their chart read, they usually mean a janma-kundali — a square diagram with twelve compartments, drawn since at least the medieval period in the way you will find it drawn today. It is not the round zodiac wheel of Western astrology, and it does not work for the same questions.
This is a short reader's introduction to what it actually shows, and what people often ask of it that it cannot give.
The shape on the page
The chart is a square. Inside the square, an X and a + divide it into twelve compartments — four diamonds at the corners, four triangles at the cardinal positions, and a central diamond. Each compartment is a bhava, a house. Each house is an area of life: the first is the self, the second the family of origin and what you say with your mouth, the third the siblings and the bravery, the fourth the home and the mother, and so on around — partnership, profession, distant places, the act of dying — until the twelfth, which is the place of letting go.
Into each of these houses fall the nine grahas, the figures the tradition treats as the moving pieces of a life: the Sun, the Moon, Mars, Mercury, Jupiter, Venus, Saturn, and the two lunar nodes Rahu and Ketu. A graha in a house is a figure standing in a room. The reading is the conversation between the figure and the room.
The third layer — time
The chart on its own is the static map. The Vimshottari dasha system, which every serious jyotisha student learns within their first six lessons, is the timing layer laid over the map. It tells the reader which house and which graha is foregrounded in any given period — for two years, for sixteen years, for the whole of a life — and so when in a life a particular indication is most likely to ripen.
Without the dasha layer, the chart shows only a person's general weather. With it, it shows the season they are sitting in.
What jyotisha is not
Three honest disclaimers. They will save you and the reader you eventually ask a great deal of bother.
It is not Western "your sign" astrology. The graha most resembling your Sun position in a Western chart will, in a jyotisha chart, often be in a different rashi. This is not because the systems disagree about the sky; it is because they measure from different reference points. The Western signs you read in a magazine column do not correspond to your jyotisha chart, and a reader who quotes them while drawing a kundali is conflating two distinct disciplines.
It is not fortune-telling. A well-read chart will tell you the kinds of things a life is set up to encounter — the hard winters and the late blessings, the recurring strengths and the recurring weak places. It will not tell you the date your business will close or the name of the person you will marry. Anyone who claims otherwise is selling something the discipline does not contain.
It is not deterministic. The chart shows the field. What you do with the field is yours. Master Bheem says it more carefully than that — that a chart is a description of the room you are standing in, and the choice of where in the room you stand is still made by you. The reader who tells you to give up on your work because Saturn is hard on your tenth house is reading on a single line; the reader who tells you that this is a period for inward work rather than outward expansion is reading the whole map.
The practice — reading your own chart, slowly
The single most useful thing the Astrology Course teaches is the discipline of reading your own chart over months, not getting it read in an afternoon. Print it. Sit with it. Identify the figures and the rooms one at a time. Look up the dasha period you are in. Ask yourself, honestly, whether the indications match what you actually see in your life. They will not match neatly. They will match obliquely, and the work of the student is to feel the obliquity.
After three or four months of doing this, the chart stops being a piece of paper and starts being a description of someone you know intimately — yourself, but on a longer timescale than the one you usually inhabit. That is the use of jyotisha. Not fortune-telling. A larger frame for a life you are already living.
Start tonight, if you have not. Get a printed copy of your chart. Identify the three grahas in their best dignity, the three in their worst, and the rashi rising in your first house. Write down what you find. Come back to it in two weeks.