Reference: http://www.mypancha ng.com/
Lord surya (sun) incarnated as lord vishnu on this day. Lord vishnu is decorated as lord sun on this day. Most vishnu temple will decorate lord vishnu as lord sun (Alankaram) on this day. Most temples will perform 'Aruna prashna' parayana on this day. Please visit your nearest vishnu or sun temple. If you are in seattle area please visit http://www.htccwa. org ( Hindu Temple and Cultural Center, WA) on this day.