Atlantic or Pacific, 8 letters
China has only one, surprisingly, 8 letters
One of twenty-four in the world, 8 letters
Pacific or Mountain, e.g., 8 letters
Atlantic and Pacific, e.g., 9 letters
Crossing them can affect you, 9 letters
Pacific Standard and Central Daylight, 9 letters
Regions relative to Greenwich, 9 letters
Things standardized by Congress on March 19, 1918, 9 letters