|Canto 6: Prescribed Duties for Mankind||Chapter 12: Vṛtrāsura's Glorious Death|
Bhaktivedanta VedaBase: Śrīmad Bhāgavatam 6.12.33
vajras tu tat-kandharam āśu-vegaḥ
kṛntan samantāt parivartamānaḥ
nyapātayat tāvad ahar-gaṇena
yo jyotiṣām ayane vārtra-hatye
vajraḥ — the thunderbolt; tu — but; tat-kandharam — his neck; āśu-vegaḥ — although very fast; kṛntan — cutting; samantāt — all around; parivartamānaḥ — revolving; nyapātayat — caused to fall; tāvat — so many; ahaḥ-gaṇena — by days; yaḥ — which; jyotiṣām — of the luminaries like the sun and moon; ayane — in moving to both sides of the equator; vārtra-hatye — at the time suitable for killing Vṛtrāsura.
Although the thunderbolt revolved around Vṛtrāsura'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 Vṛtrāsura to be killed, his head fell to the ground.
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His Divine Grace A. C. Bhaktivedanta Swami Prabhupāda, Founder Ācārya of the International Society for Krishna Consciousness