sidereal  (saɪˈdɪərɪəl)

a unit of time that is based upon the earth’s rate of rotation relative fixed positions in the sky as established by stars

maybe another name an invariant homomorphism of a circle;  ∀n∈R, ω(f) = lim [Fⁿ(x) – x] / n    as n->∞

a sideways way of looking at our world