Luni-solar influences and the length of the day

At http://wattsupwiththat.com/2011/04/10/solar-terrestrial-lunisolar-compon… by Paul Vaughn, M.Sc. It is about a French paper on solar cycles and the rate of change of the length of day, by Courtillot et al (2010). Variations in the length of day involve the lunar nodal cycle (18.6 days), the lunar apse cycle (8.85 years), the terrestrial year (1 year) and harmonics (0.5 and 4.42 yrs). See also http://wattsupwiththat.com/2010/12/23/confirmation-of-solar-forcing-of-t…