mūrdhajyotiṣi siddhadarśanam [YS 3.32]

śiraḥkapāle+antaś chidraṃ prabhāsvaraṃ jyotis tatra saṃyamaṃ kṛtvā siddhānāṃ dyāvāpṛthivyor antarālacāriṇāṃ darśanam.