The calculation formula of extreme distance and limit interval to draw curves by straight lines on projection plane is deduced.
推导了投影平面上以直代曲的极限距离计算公式，代曲极限间隔值的探求。
As well around the extreme values of sunspot activity and the time interval of relatively large variations of the acceleration of rotation of the earth may also trigger large earthquakes.
而太阳活动极值前后及自转加速度变化较大时段可能触发大地震。
As well around the extreme values of sunspot activity and the time interval of relatively large variations of the acceleration of rotation of the earth may also trigger large earthquakes.
而太阳活动极值前后及自转加速度变化较大时段可能触发大地震。
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