Between which atoms in a peptide bonds rotate to form φ and ψ angles, or form peptide bond?

-ϕ (phi): angle around the a-carbon—amide nitrogen bond (1.46A) -ѱ (psi): angle around the a-carbon—carbonyl carbon bond (1.53A) In a fully extended polypeptide, both ѱ and ϕ are 180°