Vikram Seth said this quote

All over India, all over the world, as the sun or the shadow of darkness moves from east to west, the call to prayer moves with it, and people kneel down in a wave to pray to God. Five waves each day - one for each namaaz - ripple across the globe from longitude to longitude. The component elements change direction, like iron filings near a magnet - towards the house of God in Mecca.