  A rotational lattice is a structure (L;\vee,\wedge, g) where
L=(L;\vee,\wedge) is a lattice and g is a lattice automorphism of finite order.
We describe the subdirectly irreducible distributive rotational lattices. Using
J\'onsson's lemma, this leads to a description of all varieties of distributive
rotational lattices.

Rings and Algebras