snvecR

Calculate Earth’s Obliquity and Precession in the Past

CRAN Package

Easily calculate precession and obliquity from an orbital solution (defaults to ZB18a from Zeebe and Lourens (2019) ) and assumed or reconstructed values for tidal dissipation (Td) and dynamical ellipticity (Ed). This is a translation and adaptation of the 'C'-code in the supplementary material to Zeebe and Lourens (2022) , with further details on the methodology described in Zeebe (2022) . The name of the 'C'-routine is 'snvec', which refers to the key units of computation: spin vector s and orbit normal vector n.


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  • Depends1 package
  • Imports11 packages
  • Suggests9 packages