Sandhyavandanam is a mandatory religious ritual centring around the recitation of the Gayatri mantra, traditionally supposed to be performed three times a day by Dvija communities of Hindus, particula
Veda pathashala students doing sandhyavandanam at Nachiyar Kovil, Kumbakonam, Tamil Nadu.
An illustration of a Sanatana offering Arghya from 'The Sundhya, or, the Daily Prayers of the Sanatana' (1851) by Sophie Charlotte Belnos.