The document discusses the concept of upagrahas (sub-planets) in Indian astrology. It lists the main upagrahas as Rahu, Ketu, Mars, Jupiter, Saturn, Venus and Mercury. It also mentions other upagrahas associated with the signs of the zodiac like Moon, Sun and Lagna. The text then explains the relationship and effects of the upagrahas relative to each other and the main planets in the natal birth chart. It provides details on the characteristic and placement of upagrahas in different houses of the birth chart.