Parikarma should be done 108 times.. Or multiples of 9 108 is a very important number in vedas.. The science behind is that... When u divide the distance between the sun and the earth by the diameter of the sun it will come close to 108 furthermore if we divide the distance between earth and moon by the diameter of the moon it will also come close to 108 .. That's why to get in sink with the temple u have to revolve around the temple for 108 times