 ते पदं विष्णुविक्रान्तं पतत्रिज्योतिरध्वगाः।प्रयाताः प्रहिता राज्ञा हरयस्तत्क्षणेन वै।। 
 The monkeys ordered by the king, traversed the pathway of birds and heavenly bodies, the path Lord Visnu had trod. Note the sky is called Vishnupada since Lord Visnu set his foot on the sky in his incarnation as Vamana.   