ocr: Right Correction by 1/100 second, during each of the preceding 100 - seconds Commentary At 9:00 am Japan time (midnight GMT) on January 1, 1972, the standard second on which time is based changed from the previous astronomical time' based on the earth's rotation to atomic time' based on the OsCillation of the cesium atom. The rotational speed of the earth is subject to unpredictable irregularities, and to prevent any gitterence greater than 0.9 seconds from arising between astronomical time and atomic time, the entire world makes 1-second adjustments as needed at 9:00 am (Japan time) on Januar ...
