The word Ha means ‘Sun’ and Tha means ‘Moon’ .Thus together it means to balance the Sun and Moon energies in you. It is the science of activating the third central nadi (Sushumna) which is the path to enlightenment.Hatha yoga also balances the three gunas in you, Tamas– The quality of inertia and delusion, Rajas– The quality of activity and selfishness will be tempered, While Sattva– The quality of harmony and goodness will prevail.