Bhagavatapurana 5.22.7

5.22.7

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atha ca yāvan nabho-maṇḍalaṃ saha dyāv-āpṛthivyor maṇḍalābhyāṃ kārtsnyena sa ha bhuñjīta taṃ kālaṃ saṃvatsaraṃ parivatsaram iḍāvatsaram anuvatsaraṃ vatsaram iti bhānor māndya-śaighrya-sama-gatibhiḥ samāmananti //

7. The time by which he completes his circuit in his orbit encompassing the circle of heaven and earth in its entirety is called *Samvatsara*, *Parivatsara*, *Idavatsara*, *Anuvatsara*, or *Vatsara* according as the velocity of the Sun's march is slow or rapid or moderate.