Sandhyavandanam

https://en.wikipedia.org/wiki/Sandhyavandanam

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Sri
http://www.srivaishnavam.com/stotras/prata_sandhya.htm

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Blog

1. https://trikalasandhyavandanam.blogspot.com/
2. http://knramesh.blogspot.co.uk/search/label/Sandhyavandanam
3. http://ragsgopalan.blogspot.in/2011/01/sandhya-vandanam-as-supreme-science-and.html