I read all of these and really don't have anything to add, except perhaps the name of the presiding angel (or archangel) of the day. Sunday's angel is Michael, which means "likeness of God".
I do have a few comments on Sunday's superstitions in general.
- A child born on Sunday is “blithe and bonny, good and gay”. They are often gifted and lucky as well.
- Children born on Sundays resist ill magicks as they are often considered blessed.
- Psychic powers are often strongest in those born on Sunday
I was born on a Sunday, and generally have very good luck. I do have second sight (the tedious Irish kind where I know when someone is about to die), and I make my living as a professional card reader. I am told I have a gift. And yes, as the rhyme would have it, I'm gay.
- If you sing out of tune in Church on Sunday, your dinner will be burned.
This goes a long way toward explaining why the rolls for Sunday dinner at my grandma's house were always black as coal on the bottom. She faithfully attends church, sings every hymn, and cannot carry a tune to save her life. In my great-grandmother's will, she specified no hymns for her funeral, because she didn't want her daughter to sing!

True story.