这是就天文因素的长周期变化而言。
This is as for the variation of long period of astronomical factors.
结果表明，太阳活动对大气的影响，不仅在长周期变化中存在，在逐日变化过程中也同样存在。
The result shows that there exists the influence of sun activity on the atmosphere not only in long period variation but also in daily variation.
这种震动以前被诟病为60年周期性日长变化的原因，但该研究发现的自转速度表明，它并不是罪魁祸首，英国利兹大学的乔恩芒德说。
The twisting had previously been blamed for a 60-year cycle in day length, but the rate of rotation found in this study suggests it is not the culprit, says Jon Mound at the University of Leeds, UK.
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