Āpta Pramāṇa - आप पम्ग Nathamuni's Yoga Rahasya 3.18, - 6.17

ऊर्च जिुि् कृत् ृनवूरर्मुखन ूि् उत्थ िसर नूषेतुप्ठ उनुखि्मके ūrdhve ca janunī kṛtvā śavitordhvamuk

Apta Pramana Kapalakurantaka- Hathabhyasa-paddhati 16- 17

उू्िृचिन िसूल्ा्न भननममव्ा प्दूल्ा्न भननमनवृत् ि्कभपदेृन ऊररकुच््ूषपच्क्सिन भवनू पच्क्सिेस्त् िसर सनम्लचेूषवे््सिन भवनू

utānaśayanaṃ hastatalābhyāṃ bhūmimavaṣṭabhya pādatalābhyāṃ bhūmiṃdhṛtvā nābhipradeśaṃ ūrdhvaṃ kuryāt paryakāsanaṃ bhavati paryakāsane sthitvā hastau saṃmīlayet vetrāsanaṃ bhavati

Akashic Revelation

Lying supine holding the ground by hands and holding the ground by the feet also, elevate the navel region upwards, this is called Paryankasana. Keeping the position of Paryankasana unite the hands with the feet this is called Vetrasana. 17

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