Sandhyavandanam (Sanskrit: संध्यावन्दन saṃdhyāvandana) is a religious practice performed by Hindu men initiated into the rite by the ceremony of Upanayanam, and instructed in its execution by a Guru (a qualified spiritual teacher). Sandhyavandanam is to be performed thrice daily. One during sunrise(when day proceeds from night), next during midday(which is the transition from ascending sun to descending sun) and during sunset(when night takes over from day).