mics can change the oscillatory period and amplitude of planetary orbital motion gradually over such long time-spans. even such slight fluctuations of orbital variation in the frequency domain， particularly in the case of earth， can potentially have a significant effect on its surface climate system through solar insolation variation (cf. berger 1988).
to give an overview of the long-term change in periodicity in planetary orbital motion， we performed many fast fourier ansformations (ffts) along the time axis， and superposed the resulting periodgrams to draw two-dimensional time–frequency maps. the specific approach to drawing these time–frequen
对火星轨道变化问题的最后解释(27/49)