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skylight: A Simple Sky Illuminance Model

A tool to calculate sky illuminance values (in lux) for both sun and moon. The model is a translation of the Fortran code by Janiczek and DeYoung (1987) <https://archive.org/details/DTIC_ADA182110>.

Version: 1.3
Depends: R (≥ 4.2)
Imports: Rcpp
LinkingTo: Rcpp, RcppArmadillo
Suggests: tidyr, rnaturalearth, dplyr, ggplot2, terra, ncdf4, scales, rmarkdown, covr, testthat, knitr
Published: 2025-09-24
DOI: 10.32614/CRAN.package.skylight
Author: Koen Hufkens ORCID iD [aut, cre], BlueGreen Labs [cph, fnd]
Maintainer: Koen Hufkens <koen.hufkens at gmail.com>
BugReports: https://github.com/bluegreen-labs/skylight/issues
License: AGPL-3
URL: https://github.com/bluegreen-labs/skylight, https://bluegreen-labs.github.io/skylight/
NeedsCompilation: yes
Citation: skylight citation info
CRAN checks: skylight results

Documentation:

Reference manual: skylight.html , skylight.pdf
Vignettes: skylight advanced (source, R code)
skylight use (source, R code)

Downloads:

Package source: skylight_1.3.tar.gz
Windows binaries: r-devel: skylight_1.3.zip, r-release: skylight_1.3.zip, r-oldrel: skylight_1.3.zip
macOS binaries: r-release (arm64): skylight_1.3.tgz, r-oldrel (arm64): skylight_1.3.tgz, r-release (x86_64): skylight_1.3.tgz, r-oldrel (x86_64): skylight_1.3.tgz
Old sources: skylight archive

Reverse dependencies:

Reverse imports: skytrackr

Linking:

Please use the canonical form https://CRAN.R-project.org/package=skylight to link to this page.

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.