वज्रस्तु तत्कन्धरमाशुवेगः कृन्तन्समन्तात्परिवर्तमानः ।
न्यपातयत्तावदहर्गणेन यो ज्योतिषामयने वार्त्रहत्ये ॥ ३३ ॥
vajras tu tat-kandharam asu-vegah
krntan samantat parivartamanah
nyapatayat tavad ahar-ganena
yo jyotisam ayane vartra-hatye
vajrah-the thunderbolt; tu-but; tat-kandharam-his neck; asu-vegah-although very fast; krntan-cutting; samantat-all around; parivartamanah-revolving; nyapatayat-caused to fall; tavat-so many; ahah-ganena-by days; yah-which; jyotisam-of the luminaries like the sun and moon; ayane-in moving to both sides of the equator; vartra-hatye-at the time suitable for killing Vrtrasura.
Although the thunderbolt revolved around Vrtrasura's neck with great speed, separating his head from his body took one complete year-360 days, the time in which the sun, moon and other luminaries complete a northern and southern journey. Then, at the suitable time for Vrtrasura to be killed, his head fell to the ground.