?? ?????????????:7????????
![](https://image.chezhanri.com/2019/0304/20190304161823349.jpg)
????:1??????????:????????
2?????????
3?????95?
4?????????????
5???????
???8??7??????(?????? ??)??,7?????????????,?????????????????,7??2???????????????????????????????????????,??20000??????????????(???????????????????????4??),??2.2?????????(????????????????????1.58????????????????????????)?
???????8?????7??????????????????“Geological evidence reveals a staircase pattern in Earth’s rotational deceleration evolution(?)”????????????«??»(PNAS)?????????
?????,????????????,???????????
???????,??,??????????????????????????????????
?????,???Jacques Laskar???????????????????????????????????????????2????????????,??????7????????????????2????????,???,??????????
??????????,???????7?2?????????????????????,????
???????????,??,???????????????????????????,????????????????????????????????????????
??????,??????????????(???????????????) ??????????????????????????????????:????