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地球在进行自转和公转的同时,本身也在变动着,地球究竟有哪些变动呢?根据国内外的研究成果,略举几种: 体积在膨胀:自从地球作为天体出现以后,它的体积在不断增大。到目前为止,地球的半径已增长了三分之一。地球体积增大,主要是由各大洋底部扩张所造成的。由于体积增大,地球的自转速度降低了。从有关化石上的年轮和生长线上分析,在三亿六千万年前,地球上一年为四百八十天,而现在一年只有三百六十五天。
The earth itself is changing while rotating and revolving. What are the changes in the earth? According to the research results both at home and abroad, there are a few examples: Volume expansion: Since the appearance of the Earth as a celestial body, its volume continues Increase. So far, the radius of the Earth has increased by a third. The increase of the Earth's volume is mainly caused by the expansion of the bottom of the oceans. As the volume increases, the earth's rotation speed is reduced. From the analysis of the annual rings and growth lines on the fossils, 360 million years ago on Earth was 480 days a year, and now it is only 365 days a year.