A Bhava (house) is one of 12 divisions of the sky as seen from a specific location at a specific time. While Rashis divide the ecliptic by the stars (sidereal), Bhavas divide it relative to the horizon at the moment of birth. The 1st house (Lagna) is the sign rising on the eastern horizon — this is why your exact birth time and location matter so much in Jyotish.

In Vedic astrology, the most common system is the Whole-Sign house system: whichever Rashi the Lagna (ascendant) falls in becomes the entire 1st house. The next Rashi becomes the 2nd house, and so on. This differs from Western astrology's Placidus system where houses can span unequal arcs. Our KP System tool uses the Placidus system for sub-lord calculations.

The Lagna is the most important point in a Kundali. It represents you — your body, personality, and approach to life. The Lagna changes approximately every 2 hours as the Earth rotates, which is why birth time accuracy is critical. A difference of just 4 minutes can shift the Lagna to a different Navamsha (D9 division).