Dashas
Dashas are planetary periods — the chart's timing system. Vimshottari, seeded by the Moon's nakshatra, is the default in most of India.
Levels
A 120-year cycle of nine mahadashas subdivides into antardashas and further levels. The running maha–antar pair is the first thing to check against any life question.
Other systems
Yogini, Chara and conditional dashas like Ashtottari serve as cross-checks. They arrive here with the engine integration.