The practitioner raises the śakti and the Self, attains samādhi. Through Siddhāsana, the yoga of the union of sun and moon is achieved.

This verse describes the culminating effects of Siddhāsana practice. The śakti (kuṇḍalinī) ascends upward (ūrdhvam), carrying individual consciousness toward union with the universal.

Candrārka-saṃgama — “union of sun and moon” — is a technical expression of Haṭha Yoga:

• Arka (sun) = Piṅgalā nāḍī, the hot, active, masculine energy
• Candra (moon) = Iḍā nāḍī, the cool, receptive, feminine energy

When these two opposing currents balance and merge in Suṣumnā, the central channel, the state of true yoga occurs. This union of opposites is the literal meaning of Haṭha (Ha = sun, Ṭha = moon).

Siddhāsana facilitates this union by stabilizing the body, sealing energy at the base, and creating optimal conditions for the ascent of kuṇḍalinī. The resulting samādhi is not a mental achievement but a complete energetic transformation.