The Kendra or Quadrangular groups
Aries, Cancer, Libra, and Capricorn forming the 1st quadrangle are Chara or Movable rasis. They are active by nature, like change and direct in their approach. Normally people with chara rasis dominating in the birth chart travel a lot.
Taurus, Leo, Scorpio, and Aquarius forming the 2nd quadrangle are Sthira or Fixed rasis. They take their time to act, do not like change, and have a fixed views and ways of doing things.
Gemini, Virgo, Sagittarius, and Pisces forming the 3rd quadrangle are Dwichara or Dual rasis. They are very intelligent and like exploring new ways and theories.
The Grahas or Planets and what they signify
Sun or Surya is a royal planet and the king in astrology. He represents the soul, will power, father, paternal relations, the king or the high officials. Its hot and angry, colour is red, metal is gold and gem is ruby. Sun represents the eastern direction.
The sun stays in each rasi for one month and takes one year to complete the round of the zodiac. Its motion is quite fixed and a lot of Indian festivals are as per the suns entry into the various signs. For example on January 14 it enters Makara and this day is celebrated as Makara Sankranti, On April 13th/14th it enters Mesha and this day is celebrated as Baisakhi. The change in seasons is also linked to the suns entry into various signs and nakshatras. He is the Pitrukaraka or planet connected with father.
Moon or Chandra is also a royal planet and is the queen in astrology. He represents the mind, emotions, sensitivity, the mother, house and domestic comforts, milk, sea and all things connected with the sea, hotel and food industry, textiles and apparels. Its cold and calm, Its color is white, direction north-east, metal is silver and gem is pearl. The moon is the fastest moving of the 9 planets and takes approximately 2-1/2 days to travel a sign. When the sun and moon are in the same rasi it is called Amavasya or new moon day or the 1st day of the dark fortnight. The lunar days or Tithi changes with every 12 degree difference between the sun and the moon. When the sun and the moon are in the exact opposite signs or 180 degrees apart, it is called Poornima or the full moon day or the 1st day of the bright fortnight. He is the Matrukaraka or planet connected with mother.
The sign in which your Moon is placed in the birth chart is called your Janma Rasi. The star constellation in which your Moon is placed is called your Janma Nakshatra.