Smaller lunar evectional constituent. Thi 2 2 2 s constituent, with < , : , and (S ), modulates the 2 amplitude and frequency of M for the effects of variation in solar attraction of the Moon. This attraction results in a slight pear-shaped lunar ellipse and a difference in lunar orbital speed between motion toward and away from the Sun 2 2 . Although (S ) has the same speed as S , its amplitude is extremely small. Speed = 2T - s + p = 29.455,625,30 per solar hour