From Hindupedia, the Hindu Encyclopedia
By Swami Harshananda
Sandhyāvandana literally menas ‘obeisance to God during dawn and dusk’.
The word sandhyā refers to that time when night passes into day and day passes into night. They are dawn and dusk respectively. The ritual of offering one’s obeisance to God during these periods is known as sandhyāvandana.
- The Concise Encyclopedia of Hinduism, Swami Harshananda, Ram Krishna Math, Bangalore