Sandhya Vandhanam 1.2.3

Sandhyavandanam literally means "salutation to Sandhya".
Sandhya, in turn, has traditionally been interpreted either as "the transition moments of the day" (namely the two twilights dawn and dusk), or as "the solar noon".

This is a religious ritual performed, traditionally, by Dvija communities of Hindus, particularly those initiated through the sacred thread ceremony referred to as the Upanayanam and instructed in its execution by a Guru, in this case one qualified to teach Vedic ritual.
This consists of recitation from the Vedas, accompanied by ritual.
These rituals are performed three times a day -
at morning (prātaḥsaṃdhyā),
noon (mādhyāhnika) and
evening (sāyaṃsaṃdhyā).

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