How stable is an astronomical clock that can trigger mass extinctions on earth?

Details How stable is an astronomical clock that can trigger mass extinctions on earth? How stable is an astronomical clock that can trigger mass extinctions on earth?

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984natur.311..638h&link_type=abstract

Nature (ISSN 0028-0836), vol. 311, Oct. 18, 1984, p. 638-641.

Biology

32

Companion Stars, Paleobiology, Solar System, Time Measurement, Fourier Analysis, Orbit Calculation, Perihelions, Periodic Variations, Power Spectra

Scientific paper

The results of an extensive series of numerical orbit calculations on the effect of perturbations of passing field stars and the galactic tidal field on the orbit of a double star are reported. The results indicate that, for a sun-Nemesis system, an irregularity of at least 10 percent, and more likely around 20 percent, in the period of revolution over the past 250 Myr is to be expected. This suggests that even completely accurate dating of mass extinctions and crater impacts should not be expected to yield perfectly sharp peaks in the power spectrum of a Fourier analysis.

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