snvecR: Calculate Earth’s Obliquity and Precession in the Past

Easily calculate precession and obliquity from an orbital solution (defaults to ZB18a from Zeebe and Lourens (2019) <doi:10.1126/science.aax0612>) 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) <doi:10.1029/2021PA004349>, with further details on the methodology described in Zeebe (2022) <doi:10.3847/1538-3881/ac80f8>. The name of the C-routine is snvec, which refers to the key units of computation: spin vector s and orbit normal vector n.

Version: 3.9.0
Depends: R (≥ 3.5.0)
Imports: deSolve, pracma, cli (≥ 3.4.0), dplyr, tibble, purrr, readr, tidyselect, lubridate, rlang (≥ 0.4.11), withr, tidyr, glue, curl, astrochron
Suggests: ggplot2, testthat, roxygen2, knitr, rmarkdown
Published: 2024-03-01
Author: Ilja Kocken ORCID iD [aut, cre, trl, cph], Richard Zeebe ORCID iD [aut]
Maintainer: Ilja Kocken <ikocken at>
License: GPL (≥ 3)
NeedsCompilation: no
Citation: snvecR citation info
Materials: README NEWS
CRAN checks: snvecR results


Reference manual: snvecR.pdf
Vignettes: Analyze a grid of Td and Ed values


Package source: snvecR_3.9.0.tar.gz
Windows binaries: r-devel:, r-release:, r-oldrel:
macOS binaries: r-release (arm64): snvecR_3.8.0.tgz, r-oldrel (arm64): snvecR_3.8.0.tgz, r-release (x86_64): snvecR_3.9.0.tgz
Old sources: snvecR archive


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