Astrology | Vedic Astrology | Hindu Astrology | Indian Astrology 1 st house is the main house in Vedic Astrology. If the 1 st house is weaker in the chart, it will weaken entire horoscope as this is the base of any birth chart and when a base is weaker, then results will be weaker too. 1 st house is Trine house ( 1, 5 and 9 th houses are a trine house ) as well quadrant house (1st, 4th, 7 th and 10 th house ...