We present here evidence that two previously unidentified, yet conspicuous gaps in Saturn's rings lie at distances corresponding to 2/3 and 4/3 of the planet's rotation period. Gaps such as

these can be produced in a ring of large bodies or small uncharged particles only by a non-axisymmetric gravitational field (both of the above can be associated with the l = m = 3 harmonic),

a fact that is relevant to models of planetary interiors.

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