C C 20 POINTS FROM ROTATION OF EARTH TIME SERIES (PAGE 287; FIGURE 288) C SOURCE: U. S. NAVAL OBSERVATORY (DENNIS MCCARTHY) C DELTA T: 0.25 YEAR C SAMPLE SIZE: 20 C 71 63 70 88 99 90 110 135 128 154 156 141 131 132 141 104 136 146 124 129