Jyotish is based on what Western astrologers call the whole sign house system and recognizes nine grahas (heavenly bodies or "planets") :
They also recognize twelve zodiac signs, or Rashis:
One's Ascendant, or lagna, the rashi which is rising on the eastern horizon at the time of one's birth, is the most influential and important one. Of lesser importance but still some impact is the Janma Rashi, the rashi in which the moon lay while one was born.
There are three different Jyotish chart notations, which are functionally equivalent but quite different in appearance. The following images show the same birth chart in the two main notations - North Indian and South Indian. The third notation is followed in Eastern parts of India.
| In the North Indian notation, the house positions are fixed (1st house top middle, with the rest following in counterclockwise order) and the signs of the zodiac are indicated by numbers in the chart (1 for Aries, and so on). |
Conversely, in the South Indian notation, the signs of the zodiac have fixed positions (Aries always occupies the 2nd box from the left in the top row, with the rest following in clockwise order), and the first house is marked "As" (for ascendant) with the rest following in clockwise order. |
The charts are broken into twelve sections, houses or Bhavas, each of which is related to a rashi in an equal house system. |
