To every non-cuspidal K-rational point on the modular curve X(1)(n) a
non-commutative Noetherian domain of global dimension 3 call be associ
ated: the Sklyanin algebra. In this paper we give the defining equatio
ns of the Sklyanin algebras and their centers when X(1)(n) is rational
, i.e. n less than or equal to 10 or n = 12.