Surya Siddhanta
तदन्तरे +अपि षष्ट्यन्ते क्षयवृद्धी अहर्निशोः। परतो विपरीतो +अयम् भगोलः परिवर्तते॥
In the intermediate region, the deficiency and excess of day and night are within the limit of sixty nadis ; beyond, this sphere of asterisms {bha) revolves perversely.
english translation