Procedure on the directions of performing Sandhyavandanam

I have a few questions on Madhyahnikam (Noon sandhya prayers).
1. The noon arghya pradanam is done facing north. Should the Prayaschitta arghyam also be done facing north or east?
2. Should Aikyanusandhanam at noon be done facing north or east?
3. Should the Pranava Japa (starting with Pranavasya rishi brahma) at noon be done facing north or east? Thank you.

MORNING SANDHYA SHOULD BE DONE FACING EAST.

* NOON SANDHYA ALSO SHOULD BE DONE FACING EAST ONLY. RIGHT FROM BEGINNING TO THE END. NO NORTH BUSINESS.
* WHEREAS IN EVENING SANDHYA VANDHANAM THERE ARE SOME CHANGES.
* UPTO ARGHYA PRADA:NAM, IT SHOULD BE DONE FACING NORTH.
* STARTING FROM ARGHYA PRADA:NAM IT SHOULD BE DONE, FACING WEST.
* BUT, WHILE DOING A:CHAMANAM IN BETWEEN, IT SHOULD BE DONE FACING NORTH ONLY, FOR, DOING A:CHAMANAM FACING WEST IS PROHIBITED.
=Chinnajeeyar=