on or at Sunday noon

[dido4]

There is a party at Beatrice's house on Sunday noon.

Which is right? on Sunday noon. or at Sunday noon.

Q:Which preposition is right for the sentence above? Thank you.

 

[outofdejavu]

[Not a teacehr]

IMHO, at.
It is "Sunday noon" that you have to take into considertation; not just "Sunday."

 

[engee30]

There is a party at Beatrice's house on Sunday noon.

Which is right? on Sunday noon. or at Sunday noon.

Q:Which preposition is right for the sentence above? Thank you.

You say on Sunday, but at noon. In this case, the name of day of the week determines the use of on in the phrase:

on Sunday noon
just like in:
on Sunday night (on Sunday, but at night)

You can also say Sunday noon, without the prepositon on, though.