Madhyahnikam must be performed facing the direction of North. This is followed by a percentage of people. The Lifco edition of Vadakali Trikala Sandhyavandanam books says so. The Sandhyavandanam PDF released on ‘Prapatti.com’ by Sri Sundarkidambi with the blessings of Shrimad Andavan says that Madhyahnikam is done facing the Eastern direction. A few from the Smartha sect do Madhyahnikam, facing the East. As per my experience, until the sun comes directly above, Madhyahnikam is performed facing the East and if it moves from this position, Madhyahnikam is done facing the North. Since there are differences in the practice, I have also heard one can do this as per the practices of the family or the advice of the family vadhyar. Is this correct? Why this contradiction? Kindly explain.